If You Kill Him You Will Be Just Like Him

"Burns: Don't kill me!

Abe Simpson: I ain't gonna kill ya. That'd be cowardly. Monty Burns cowardly! I just wanna watch you squirm."

- The Simpsons, "Curse of the Flying Hellfish"

Very traditional line spoken as the hero has the villain in their power. It could be said by the hero, the former Distressed Damsel, or even the villain themselves if they're aware of the rules of the trope. The goal is to evoke a Not So Different moment.

The most common situation involves the villain hanging over a cliff or building, and the hero deciding whether to drop them or lift them up. Usually, this is a difficult choice for the hero because the villain has proven to be a Complete Monster or done them great harm personally. Also common is the villain's attempt to pull the hero over the edge after they decide to let said villain live, resulting in the hero accidentally losing their grip, and the villain getting a Karmic Death that isn't the fault of the hero.

For some reason, this form of heroic morality only counts for the head villains. The hero may have consciously wiped out scores of Evil Minions and Mooks to get to this point, some in deliberate ambushes. None of them count, probably because that was technically in self-defense, and to get in that Dramatic Pause that occurs during instances of this trope, the scene doesn't look much like self-defense. Normally the difference is that instead of an actual battle where the underlings have a chance of fighting back and possibly killing the hero, this would be cold blooded murder given the circumstances. See What Measure Is a Mook? for more on this.

Oddly, very very few heroes answer this challenge with a simple "The difference between me and you is I'm going to kill someone guilty and you've been murdering people who were Innocent Bystander." (or "The difference between me and you is I'm not about to die.") Unless the story is trying to bust out the Idealism extreme of the Sliding Scale of Idealism Versus Cynicism the Villain will most certainly not see the error of his ways after being Forgiveness, and by allowing him to live because you'll be as bad as him makes you kinda worse than him, as he'll make another world-wide incident where tens of thousands die.

In most cases in which the situation plays out exactly like this that doesn't involve a Karmic Death also involves not bringing the villain to any other form of justice whatsoever. That is, unless the hero personally administers Cruel Mercy, which may in fact be worse than having simply killed them. Or cooler.

Contrast with Kill Him Already. Compare with Save the Villain and Sword Over Head. Anti Heroes are exempt from all four. Compare/Contrast Strike Me Down with All of Your Hatred.

The Dog Bites Back and Disney Villain Death may be used to evade the consequences.

A subtrope of He Who Fights Monsters. See If You Taunt Him You Will Be Just Like Him for when the stakes involved in this situation are notably lower. See also Jumping Off the Slippery Slope. A very common kind of Moral Dilemma.

Anime and Manga

 * Vash, the Martial Pacifist hero of Trigun, goes through the tortures of the damned rather than kill anyone specifically to avoid this trope. Accordingly, the entire last half of Trigun has the Big Bad sending his his suicidal followers to try and forcefully Invoked Trope it.
 * In Death Note, Ryuk tells Light that if he kills all the bad people in the world, then he himself will be the only bad person left. Light deflects this entirely, because his perspective is Godawful.
 * Light is a GOD! He cannot be bothered by your trivial and narrow-minded views on good and evil!
 * It can sound like irony just there, until you get to know him better.
 * Suzaku in Code Geass comes within an inch of using drugs to interrogate Kallen. He only stops because his final words to her, "You will follow my orders," is the same thing (or so he rationalizes) as what Lelouch does with Geass. Also, but this may or may not count, V.V. tells Lelouch that he's becoming more and more like the Emperor, who he's out to destroy in the first place.
 * justification for not pulling the trigger on  in Mobile Suit Gundam 00, although it remains to be seen how long he can hold on to his convictions.
 * Likewise, in conjunction with Marina's song,  unstated justification for not killing  . The latter doesn't fight again until the penultimate episode.
 * This appears to be an extremely jarring false dilemma, given that  initiated the encounter; killing a Complete Monster in self-defense does not equate to
 * is warned that her desire to kill  to   will make her no better. Indeed, when she actually
 * In the manga and second anime of Fullmetal Alchemist, several characters attempt to keep . At least   has no qualms about executing him and offers to , but they all agree on the detail that subjecting him to horrible torture first is taking it a step too far.
 * Scar adds an extra spin by pointing out that if Roy goes through with it, he'll be just like him.
 * Note that the reason for this isn't because he was going to horribly torture him, since at that point it would be near impossible to hurt without killing him anyway, but because of the reasons for doing so. Roy was going to kill him for personal reasons like vengeance instead of duty, and since his goal was to become, he can't become the sort of person ruled by his emotions.
 * In the first anime, Ed spends every fight with Scar telling him that the slaughter of alchemists and Amestrian troops isn't the answer, and that he must be brought to justice for those crimes as well as . Each time, Scar shows Ed more and more horrible deeds he's avenging, which Ed always brushes aside. Eventually, upon confronting Scar in Lior when Scar's about to , Scar pounds into Ed that   and that all of it was partly Ed's fault. Ed still refuses to condone what Scar is doing, but when Scar orders him to get out of Dodge  , Ed shuts up and meekly complies.
 * In the second season finale of Rozen Maiden, Jun utters the line when Shinku was about to kill Barasuishou..
 * The titular character in Ginga Densetsu Weed. So much, especially during the final episode in which  There's quite a few examples in this series, suffice to say.
 * In the Full Metal Panic novels, this is pretty much what Tessa tells Sousuke during the Behemoth arc, when he decides that shooting Takuma would be an effective action to take. "It would be the most logical and secure route, but we can't go about it that way," she said as though trying to convince herself. "If we were to kill him, we would be no better than them. Our organization would lose all meaning." Sousuke is slightly skeptical about this (seeing how Kalinin, his adoptive father whom he was always taking orders from, undoubtedly would have done what he was about to do), but nevertheless follows orders, seeing how he doesn't really care either way. Of course, later on, the fact that she let Takuma live lead to a huge amount of destruction...
 * In Karano Kyoukai, Mikiya doesn't want Shiki to kill, despite him being a crazy cannibalistic superman, because he feels that Shiki isn't and shouldn't become a murderer.
 * Dragon Ball:
 * When Vegeta is finally taken down by Goku and his True Companions, he tries to crawl back to his space pod and make his escape. Krillin grabs a nearby sword, intending to put the heavily wounded Vegeta down once and for all. But Goku stops Krillin and asks him to let Vegeta live. In some versions of the English dub, he justifies this by telling Krillin that killing Vegeta in cold blood will make them just as bad as he is. The original story averts this, however: Goku doesn't care about the morals of the situation, he only wants Vegeta to live so he can fight him again, even though he knows this potentially puts the Earth at tremendous risk. Goku even admits this is a selfish request.
 * Goku decides not to finish off Frieza after defeating him in battle, which is an extremely hard decision for him to make. He even gives him some of his energy.
 * In New Grappler Baki, Katsumi Orochi gets beaten the hell out of him by an escaped mass murderer named Dorian. When Retsu Kaio returns the returns a beating to him, Katsumi enters the scene and soaks Dorian with gasoline and is about to torch him, when he suddenly stops and says that if set him on fire, he would cease to be a true Karateka, so he walks away. Then he goes: "Actually, that wouldn't bother me at all." Cue the BBQ/delicious subversion.
 * Naruto Shippuden, has Pain saying this to Naruto,
 * In the Story Within a Story of the music video arc of Skip Beat, Kyoko's character, an angel, is forced to murder Sho's character, a demon, in order to protect her friend. This fills Kyoko's character with such guilt and rage that she becomes like a demon herself.
 * This is found a lot in Rave Master the reason Haru gives for not wanting to kill his enemies is because he'll be just as bad as them. He didn't actually kill anyone
 * Turns up in the climax of the final episode of Noir.
 * Used in Omamori Himari. Made especially justified by the fact that the girl that Shizuku wanted to kill wasn't the man who killed her family. The girl was the great-granddaughter of the man who genocided the Mizuki race, and happened to be completely ignorant of her long-deceased ancestor's crimes.

Comics
"Wolverine: Heck, they killed your parents. It's a good killin', ain't it? Ain't it?
 * Hugely averted in The Astounding Wolf Man where Gary sets out to kill  for what the latter did to his life. When Gary finally gets the chance he takes it.
 * Batman seems to find himself in this predicament fairly often:
 * This is invoked maybe half the times he goes up against the Joker. The comic book series also highlights the cost of Batman's decision: Joker's victims are estimated in the thousands, all of whom Batman is indirectly responsible for.
 * Seen in the Crisis Crossover Infinite Crisis, when he very nearly blows the head off of Lex Luthor's Alternate Universe doppelganger and (of course) relents. 15 years ago, he nearly did the same to Nineties Anti-Hero The Reaper.
 * In Knightfall, Dick Grayson (Nightwing), and Tim Drake (Robin), come upon Bruce Wayne just as he has apparently killed the Mook who was attacking him. An outraged Nightwing declares: "killing this creep doesn't make you as bad as the slime we used to fight, it makes you worse, because THEY never stood for anything!".
 * In Under the Red Hood, Batman's fear is that if he started killing, he wouldn't be able to stop. Used to justify why he hasn't taken out the Joker at the very least, given how the latter is utterly beyond redemption and has racked up a ridiculously substantial body count. But if it's okay for Batman to kill someone, it might be okay for Batman to kill anyone.
 * Subverted in Birds of Prey #73, when Vixen thanks Huntress for "not giving in" and executing evil cult-leader Sovereign Brusaw, to which Huntress replies "Don't thank me... The truth is, my crossbow jammed."
 * Played straight at the end of Batman/Huntress: Cry for Blood, when The Question begs Huntress not to kill Santo Casamento;
 * Kremlin references the trope in Ex Machina Special #2 and states how he thinks such is an out of date, fairy tale ideal.
 * Averted/Played with in Atomic Robo when
 * Superman's long lived in fear of sliding down this slippery slope, and, in the Silver Age Alternate Continuity story Whatever Happened to the Man of Tomorrow?, it comes to pass when Superman, in order to save himself, his remaining friends, the world and possibly the entire universe, is forced to deliberately kill the villainous . While everyone else tries to convince him that his decision was clearly justified, he refuses to take the risk, cites this very reasoning as a condemnation of his actions, and so carries out a promise that if he should ever take a life, it would be the end of Superman.
 * Averted in one post-Crisis arc when Superman is brought to an alternate universe where three Kryptonians, each more powerful than he is, released from the Phantom Zone end up killing all life on Earth. When they promise to find their way to Superman's universe and do the same thing, he feels he has no choice except, as the representative of justice on the planet, to execute them through kryptonite exposure. When he gets back home the next story arc has him suffering a Heroic BSOD as he deals with the choice he made.
 * Spider-Man does it often. For example: he uses that argument while arguing with Clint Barton and the rest of the New Avengers that thinks about killing Norman Osborn, and not so long ago stopped  from killing his old man by saying, that if he'll do it, he will become exactly that kind of man his father always wanted him to be.
 * Peter got one recently at the end of the Grim Hunt story, where he's shown a vision of the future if he kills . The reaction of the fandom was... unexpected, as the two page spread that encompassed the vision not only showed Peter apparently becoming a complete and utter Badass, but featured the fan-favorite "Happy Birthday" costume. Cue the fans shouting "Kill the guy!" at their comic books.
 * In Spider-Man Noir, this gets played interestingly because Spidey gets this lecture from Aunt May (who doesn't know his true identity) after he's already killed the Vulture - even though he was going to kill and eat her and she knew he did the same to her husband! During the lecture, Peter thinks to himself that she doesn't understand... but after she says she doesn't want to live in a world where men kill each other like animals, he realizes he's the one who didn't understand. He tries to live up to her expectations when he raids the Goblin's torture house, where he doesn't kill any of the Goblin's men except Kraven, and only in self-defense. He even refuses to kill the Goblin when given the chance, because he wants to see him properly brought to justice.
 * Wolverine regularly tells younger, softer, less inclined characters to back off or stay outside before going in to finish off the bad guys. Normally, he states in some manner that only people who are going to do what needs to be done should go in.
 * It's kind of hazy, but IIRC this is one of the reasons Wolverine is even included on some of the teams he's been on. I remember once Nick Fury specifically explained his inclusion as "...because when it comes down to it, none of you are killers. He is."
 * Correct, this happened during the Infinity Gauntlet affair. Fury brought both Hulk and Wolverine in because they would kill Thanos, instead of just trying to beat him.
 * Played straight in one issue of Wolverine's self-titled comic, when confronting Reno and Molokai, hitmen who had murdered Jubilee's parents.

Jubilee: You kill people! You've killed so many, and...

Wolverine: Yeah. You wanna sit up some night with me and talk to all of 'em?"


 * Jubilee then settles for a Groin Attack on both of them.
 * Everyone's favorite Cosmic Horror, Shuma-Gorath, is immortal for this very reason -- anyone who kills him will start to become a new Shuma-Gorath. Doctor Strange took his own life rather than allow that to happen, which still didn't work. Fortunately an ally was able to purge Shuma's energies from Strange and bring him back.
 * Lampshaded during Planet Hulk, when Miek kills the Imperial Headman who murdered his father in front of him, in view of the man's own children. The Headman notes that Miek is now just like him.
 * The subject doesn't come up much in Sin City, although the series makes no qualms about presenting its Antiheroes as batshit insane in some cases.
 * In Denny O'Neill's The Question, Vic Sage finally takes down the first arc's Big Bad, the corrupt Reverend Hatch, and explicitly invokes this Trope. "I could kill you...but then I'd be something just like you. Something vile. So I won't." He turns his back and walks away...Hatch draws a concealed weapon...and then Myra shoots Hatch in the back. "Maybe he wouldn't...but I will."

Fan Works

 * In With Strings Attached, John uses this, more or less, to calm Paul down after the Hunter slaughters a bunch of wolves in front of him and Paul struggles not to go berserk on his ass. It works on both Paul and the Hunter; the latter is stunned that people with such power would choose to not use it to kill, and.
 * To Kill a Thief: This is what Light wanted because of Not So Different.

Film
"Joel (as Ator): Then why the heck did I hang-glide in here, anyway?"
 * The Emperor tries to get Luke to try to kill him (and later, to kill Vader) in order to corrupt him in Star Wars: Return of the Jedi; it is not clear whether he was confident that Luke wouldn't actually be able to do so, or was genuinely prepared to die to ensure that the Empire would be in good (that is, evil) hands.
 * Due to the powerful corrupting nature of the Dark Side of the Force, this claim has very literal weight behind it, rather than the more metaphorical standard for this trope.
 * In the Expanded Universe, The Emperor had a limitless supply of clone bodies that he could spirit jump to. He could secure Luke's fall and come back.
 * Played straight in the gag-worthy ending to Knight Rider 2000.
 * Played straight, then subverted in Rush Hour 2. Lee has Ricky Tan, the Big Bad at gunpoint, when Ricky starts taunting him, and Lee's partner Carter tells him, "He's trying to trick you, don't go too far." That is until Ricky says Lee's father was "pathetic," at which point Carter changes his tune to "Shoot his ass!"
 * Rather bafflingly employed in the finale of Road House: Patrick Swayze is unable to kill the evil crime lord, despite having killed his henchmen in hilariously violent ways (ripping out throats, etc.) just moments earlier. Then the townsfolk that the crime lord had previously bullied show up and blast him with shotguns anyway. ... Hooray?
 * While it isn't a villain, this trope is basically what stops Sarah Conner from killing Miles Dyson. She sees in that moment that if he kills him, she'll be just like the other Terminator who tried to kill her to change the future.
 * Played straight in the finale of the film Prince Caspian. Caspian decides at the last moment not to kill Miraz in an arranged duel, even though he's fully prepared to hack-and-slash his way through Miraz's army a few moments later, had no trouble chopping up bad guys at the castle a few nights before, and could probably fill a book with unassailable reasons that necessitate Miraz's death.
 * Played dead straight in X Men Origins Wolverine, by Logan's squeeze Kayla, in regards him killing off Sabretooth and/or Stryker. Two men, who have been rounding up mutants like cattle, are effectively above the law, and will most likely continue to hunt Logan down as long as he lives. All of which could be solved by a little extra stabbing...
 * Played even straighter in X-Men: First Class, where : after most of the film is spent with Charles and Erik arguing over whether Erik should kill Shaw, Erik
 * Subverted in Darkman. The movie ends with the hero dangling the villain off a building. The villain goads Darkman into killing him and then explains why Darkman won't let him fall, asserting that he could never live with himself. Needless to say, down he goes. "I'm learning to live with a lot of things," mumbles Darkman.
 * Done mind-bogglingly badly in Cave Dwellers. As Ator is about to kill the villain, his old mentor declares that to kill him would be murder, and that "It would make us no better than the barbarians!" (Tom Servo points out, "We are barbarians!") Ator drops his sword, turns around... and is only saved from a Back Stab by his Asian sidekick nailing the villain with a throwing knife.

"Dr. Velislava: You do this, you are exactly like us.
 * Subverted in Train. When the head of the organ harvesters who've killed most of the protagonists is at the mercy of the Final Girl, she tries this.

Alex: Maybe I am. [proceeds to beat Velislava up and then burn her to death]"

"Henri Ducard: Your compassion is a weakness your enemies will not share.
 * Played straight in Mannequin 2: On the Move. The Prince has the Count by the throat, dangling over the edge of a hot-air balloon basket, high above the streets of Philadelphia. He decides that he can't kill the Evil Count. Of course, as soon as lets the Count back in the basket, the Count reminds us that he has no hesitations about killing others.
 * Invoked in Batman Begins when Bruce Wayne (not yet Batman), refuses to kill a criminal as part of his training

Bruce Wayne: That's why it's so important. It separates us from them."

""I won't kill you, but I don't have to save you.""
 * During the climax of the movies, after Batman defeats Ras, he doesn't kill him because that would give Ras the final victory, but finds a loophole. Since they are on a train that's going to crash, well, let this line explain it:

"Scar: What are you going to do? You wouldn't kill your old uncle, would you?
 * Played straight in many Disney movies, one notable one being The Lion King.

Simba: No, Scar. I'm not like you."


 * But he immediately followed this with offering him a particularly ironic form of Cruel Mercy.
 * Both the film and book The Lord of the Rings trilogies have this regarding trying to use the Ring. Film Galadriel puts the most dramatic point on it. Unlike most of the characters who want to claim it, she's probably not deluding herself about her ability to do so, but it all still ends with Middle Earth under the rule of a "dark" overlord.
 * Suspect Zero: The film's antagonist O'Ryan ultimately wishes to drive FBI Agent Mackelway to kill him, in an effort to force Mackelway down the path to taking over his mission as a.
 * This trope is delivered word for word by Morgan Freeman's character in the end of Unleashed.
 * Spoken almost word for word by the Love Interest to Latif in The Devils Double.

Literature
"Petra: "Please don't kill him, Bean. Please."
 * In Harry Potter, Harry stops from killing, who had betrayed Harry's parents' whereabouts to Voldemort, because he was sure his father wouldn't have wanted his old friends to become murderers, even in revenge for his own death. Notably, however, he didn't regard this as any kind of mercy for  sake, and was happy for him to go to Azkaban prison.
 * A variation is used in book two of The Bartimaeus Trilogy: True Neutral (or so he claims) djinni Bartimaeus persuades to save  by hinting that, 'If you let him die, you'll be just like me.'
 * Used in the book Komarr in the Vorkosigan saga by Lois McMaster Bujold. Komarran terrorists are about to activate their new weapon, in revenge for the Barrayan massacre of Komarran hostages a generation ago. When the army closes in, they threaten to murder their hostages,  if Imperial Auditor Miles Vorkosigan doesn't order the army to back off. Miles tells them, "Please observe that you have now gone as far as you can without turning yourselves into a perfect replica of the enemy you set out to oppose."
 * The Discworld novel Jingo implies that Sam Vimes believes something like this. He's all right with killing someone by accident, but a pre-meditated killing leaves him deeply troubled. In the next City Watch book, Night Watch the Gargoyles parallel is even more explicit, as he's now shown to be perfectly willing to kill other people intentionally when he's in the middle of a pitched battle.
 * In The Fifth Elephant, he had no choice but to kill Wolfgang but refused to deliver any of the Bond One Liners that came into his head because he feared becoming the Complete Monster that Wolfgang was.
 * Another Terry Pratchett book, "Nation", has this discussed as a theme, though the focus is more on the thinking like the villain, than the actual act of killing. First Mate Cox is cruel and evil, enjoying killing simply for the joy of it. When he mutinied against The Good Captain, said captain nearly fell for this trope. Later, Mau is afraid of thinking like him, but decides that any hunter must think like their prey, yet does not turn into it.
 * The Bandakarians in the Sword of Truth book Naked Empire believe something akin to this in relation to all killing. Including that in battle.
 * Subverted in Shadow of the Giant, when Bean grabs Volescu, a man who tried to redesign the human race by, by the throat and threatens to kill him:

Bean: "Remind me why."

Petra: "Because we're good people."

Volescu: *laughs* "You live by murder. How many people have you both killed? And if we add in all the Buggers you slaughtered out in space..."

Petra: "Ok, go ahead and kill him.""


 * In book ten of A Series of Unfortunate Events, with Sunny captured by Olaf and one of his top goons heading towards them, the kids decide to set a trap to gain a hostage of their own to possibly trade for their sister. But before they do it, they have an epiphany: if they capture this woman, it will make them evil like Olaf, so they surrender to her and she takes them to Olaf. And these kids are supposed to be the smart ones in a world of useless adults.
 * Unintentionally invoked by the Dark Jedi Yun after he's defeated by Kyle Katarn in the novelization of the PC game Jedi Knight. After Kyle disables Yun's sword arm, the younger man spits "So, kill me, Rebel, just as I would kill you!" Kyle is about to, when he realizes that he doesn't want to do what Yun would. He doesn't want to be the kind of man who would kill without reason, and Yun is no longer a threat. This act of mercy also starts Yun on the path to his Heel Face Turn.
 * In The Pendragon Adventure,it's brought up several times by characters that Bobby, as leader, shouldn't become a killer. You'd think it was the usual argument about morals, and being just like Saint Dane, and it partially is, but
 * Harry tries this on the werewolf leader in the second book of The Dresden Files, Fool Moon, but she simply points out that there will be one important difference: the villain will be dead.
 * Harry tries this on the werewolf leader in the second book of The Dresden Files, Fool Moon, but she simply points out that there will be one important difference: the villain will be dead.

Live Action TV
"Willow: You know what I mean. It's not like we can just stake these grunts in the heart, right? Not killing humans is what separates us from the bad guys.
 * Subverted (and possibly lampshaded) in the Battlestar Galactica Reimagined episode "Blackmarket." Lee is holding the big bad at gun point, and the big bad claims that Lee will not shoot because "You're not like me." When Lee does not lower the weapon the man starts to say it again and Lee shoots him dead. The producers say this never happened, and all events from that episode (With the exception of the death of Pegasus's CO) are never referred to again.
 * Twenty Four's Jack Bauer doesn't bother with this trope, killing several villains in cold blood including
 * In an episode of Stargate SG-1, Daniel Jackson and Captain Samantha Carter come across a vat of young Goa'uld symbiotes, Daniel is about to shoot it when Captain Carter says that if he does he will be as bad as the Goa'uld. They begin to walk away but then Daniel suddenly turns and fires at the vat anyway, killing the symbiotes.
 * Subverted in Stargate Atlantis, Shephard and Michael fight on the roof-tops. Michael hangs from the roof by his finger-nails. Earlier in the episode. Michael had threatened Teyla's baby. Teyla stamps on one hand and then the other. Michael falls to his doom. Mom morality pwns Hollywood morality.
 * This is part of the philosophy of the Ancients in Stargate SG-1. They believe in the free will of every being and even though they have the power to eliminate every threat in the galaxy, they still don't do it. This, however is taken to such an extreme that one can only declare them guilty.
 * Then again, later seasons reveal the existence of the Ancients' evil counterparts, the Ori. A rival group of ascended beings who are more than happy to maintain complete control within their galaxy by enslaving everyone. The Ancients were actually exiled by them because of this difference in philosophy, so it makes sense the Ancients themselves would be really worried about slipping down the slope if they start interfering and solving mortals' problems. They do prevent the Ori from acting directly in our galaxy, but the Ori's followers are free-willed (if misled) mortals, so the Ancients don't do anything to stop them.
 * Faith pulls this on Buffy the Vampire Slayer to break a Mexican Standoff where she and Buffy both have knives to the other's throat. Unique in that Faith seems to somewhat want Buffy to kill her and thus become like her, as some form of revenge. Yeah, Faith had issues...
 * Xander raises this concern, when Buffy is intent on killing Faith. Not only does she ignore him, after she failed and Faith wakes up from her coma, Buffy follows her onto Angel for another go.
 * In Issue #8 of Buffy the Vampire Slayer Season Eight, Buffy finally says what we all think of when this trope is done poorly.

Buffy: No, not being bad is what separates us from the bad guys."

"Virginia: "No! We can't kill him."
 * IN S5's "The Gift" Giles hasa Genre Savvy moment and decides not to expose Buffy to these moral questions with Ben/Glory, and kills Ben/Glory himself.
 * Although never actually spoken, it is heavily implied (and even nearly subverted) during the scene at the Huntsman's treehouse in The Tenth Kingdom, when Wolf is about to kill him with the magic axe and Virginia stops him.

Wolf: "Of course we can, he'd kill us!"

Virginia: "That's not the point, he's helpless!"

Wolf: "Exactly why we should kill him now!"

Virginia: "Wolf, no!"

Wolf: "Awwww, he's gonna come after us!"

Virginia: "I don't care, we're not killing him."

Wolf: "You're gonna regret this moment.""

"Mal: "Guess I'm just a good man. [stabs opponent again] Well, I'm all right.""
 * And of course, he's right.
 * Common in Doctor Who, where the highly moral Doctor often must make a difficult decision between killing his enemies (technically a violation of his principles, though he's forced to do so more often than not) or showing mercy at the risk of them going on to hurt others. He often settles for giving them a fair chance to leave peacefully, even pleading with them to "just walk away." A noteworthy example in "The Doctor's Daughter", when he seems about to kill a man in vengeful anger but then puts the gun down, explaining, "I never would," despite his rage.
 * The Doctor almost references this trope by name in "Genesis of the Daleks" when he hesitates in killing a large number of baby Daleks, stating that if he did so he'd "become just like them". In the new series episode "Dalek", the Doctor IS prepared to simply blow away the titular creature, but Rose pulls this trope on him.
 * And yet sometimes his "mercy" is pretty severe, in "The Family of Blood" where
 * A variation (and eventual subversion) occurs in the Babylon 5 episode "Deathwalker" when the title character flaunts her miracle cure to Commander Sinclair, a miracle cure that requires the death of another living being to manufacture. "The billions who live forever will be a monument to my work, and the billions who are murdered to buy that immortality will be the continuance of my work. Not like us? You will become us." The subversion comes when the deal is made to research her cure anyway... only to have the Vorlon ambassador destroy her ship, claiming the younger races were not ready for immortality.
 * In "In the beginning" (a spin-off depicting the Earth-Minbari war) Dr. Franklin is revealed to have gathered extensive biological information on Minbari after he tried to cure a group of sick aliens, but he's unwilling to pass the info to the military, since they'll most certainly use it to create bio-weapons and he considers using it to be as bad as the genocide that Minabari are inflicting.
 * Subverted and yet played straight in an episode of Fastlane. Billie has the criminal who ruined her life at gunpoint when one of her male partners arrives and yells, "Don't do it! Not like this! (Dramatic pause) Use my gun! It has a larger caliber so it will be more satisfying." Her other partner has a similar do-it-this-way comment (which I can't remember), but they're both using reverse psychology to convince her not to kill the criminal. Maybe. Well, she doesn't, anyway.
 * A non-killing example: In an episode of the sitcom Taxi, an arrogant hairdresser (played by Ted Danson of Cheers, of all people) gives Elaine a truly horrific new hairdo. She, Alex, and Louie go back to confront the man, who is utterly unrepentant. An enraged Elaine is about to dump a large bowl of some noxious liquid over the man's head, when Alex gives the standard "no better than him!" speech. Elaine agrees and backs down, only for Louie to gleefully state: "She may be better than you, but I'm not!" BLOOP.
 * Played bizarrely straight (and by a character who should have known better) in Criminal Minds; an episode of the second season ends with one of the agents pondering, apropos of almost nothing, how much difference there REALLY is between the offenders that they hunt, and the agents themselves. In this corner, an antisocial, sociopathic recidivist murderer who was abused by his parents for fifteen years and slaughters innocent women purely for the sexual thrill that it gives him. In the opposite side, an agent with ten or fifteen years of experience in fieldwork with the FBI who is willing to fire their weapon ONLY in cause of self-defense or the preservation of another life (and even then, only with utmost angst over the decision afterward), and who has dedicated their professional life to the incarceration of those who would commit such heinous crimes. Yeah, that's a real slippery slope right there.
 * Also from Criminal Minds: In an episode of season three, a man takes it upon himself to rescue his kidnapped daughter, but is interrupted from killing him by Agent Reid, who tells the man that if he kills the kidnapper, he'll introduce a cycle of violence into his daughter's life. As he pleads with the father, asking him when the violence will stop,
 * MacGyver, being a Technical Pacifist, was rather fond of pulling this gem out whenever his sidekick-of-the-week had the villain at their mercy. Perhaps most brokenly, it's the reason that a Holocaust survivor refrains from shooting the Nazi who is most of the way to succeeding in her plan to infiltrate all aspects of the US Government with neo-Nazis. Apparently, killing one person who has the resources and intent to commit genocide and is most of the way to enacting that plan and has already orchestrated numerous murders is morally exactly the same as being a Nazi.
 * Hilariously played with in Firefly, where Mal wins a sword fight and is encouraged to kill his opponent who is beaten and lying on the ground. He's told it's a matter of honor, but Mal responds, "Mercy is the mark of a great man." Then stabs him.


 * Sort of inverted in an episode of Are You Afraid of the Dark? ("The Tale of Cutter's Treasure").
 * On Smallville, one of the only times Clark has intentionally killed an opponent was when he faced the alien warrior, Titan. Clark reflects that, for a moment, he actually enjoyed it. He also clearly killed Brainiac (or tried to), rationalizing that machines aren't alive.
 * In the 1998 series Merlin, Vortigern kills the Knight Templar King Constant and takes his throne, then promptly turns into an even worse king himself. Merlin comments, "And one tyrant smoothly passed the crown to another, even worse."
 * In The Shield, Vic Mackay regularly breaks the law to catch criminals. One could argue that he's better than the criminals, because he's breaking the law to keep his precinct safe. But then Cavannaugh develops a vendetta against him, and resorts to breaking the law to bring him down. So... he becomes a corrupt cop to bring down a corrupt cop. One of the most justified examples of "You will be no better than him", since if you think that breaking the law to catch a criminal is acceptable, then Vic should be allowed to do his thing. And if you think that it's not acceptable, then Cavannaugh's actions are not justified.
 * Justified in the 2006 Robin Hood series: Prince John promised that if Robin kills the Sheriff, then John will kill all the Peasants in Nottingham.
 * Used and justified in the Farscape three-part episode "Look At The Princess." At the end of the trilogy, Crichton has Scorpius at his mercy and is ready to shove him into a vat of acid; however, at the last minute, he finds himself unable to go through with the murder, and lets Scorpius off with a warning. Later, it's revealed that this had absolutely nothing to do with any fine motives on Crichton's part- he literally couldn't do it because . Of course, even if he had been able to overcome , it probably wouldn't have done much good, because as soon as Crichton has left the room, Scorpius casually reveals that his gimp suit can't be so easily dissolved by the acid.

Other Media

 * Parodied in this Picnicface video.
 * Towards the end of the Karda Nui arc in Bionicle, a shadow corrupted Takanuva enters a near-Unstoppable Rage and almost kills a few Makuta in revenge for what they did to him. He is stopped when Kopaka pulls a Get a Hold of Yourself, Man! and cites the Toa's Thou Shall Not Kill code when he tells that he'd just be giving into that darkness inside if he did it.

Tabletop Games

 * Lucius the Eternal from Warhammer 40000 literally embodies this trope. As in, if you kill him, you will turn into him. Right down to the clothes, which will only have one difference: your soul, nailed to the surface with all the others who have killed him in past. The only possible way to avoid this horrific fate is to kill him without feeling any kind of pride at having done so...or possibly to take an extremely fast-acting poison as soon as you kill him. Unfortunately most of his victims don't know this.

Video Games
" :You think I'm some kind of monster, don't you? All I did was kill a Sith! How many Sith have you killed? Dozens? Hundreds? Thousands?
 * In Splinter Cell Conviction, the final boss gives you a choice to either kill him or spare him, either of which nets you an achievement. In the twist ending, if you spare him, Grim kills him instead.
 * In Saints Row 2, the boss gives you this choice but the player kills him mid-sentence instead.
 * The 360 game Ninety-Nine Nights has the two main characters in different play throughs in the same situation where they get a chance to kill the main villain. The noble Aspharr spares the goblin king and is bathed in holy light for his mercy. The vengeance driven Inphyy kills him and the holy powers she had been using the entire game reverse on her making her the new villain. The game also features the second corollary of this trope in that in the course of sparing this guy you killed thousands of his soldiers, his priests and various commanders (Not to mention kings of other races) with no such karmic backlash.
 * Advance Wars: Dual Strike features Von Bolt - an old man using technology to sucking the life force from the land in order to extend his own life - saying this to Jake in his Not So Different speech during the game's ending; if Jake shoots him, they'll both be guilty of the same thing: killing others to save themselves. The game then lets the player decide.
 * Invoked Trope in Advance Wars: Days of Ruin. is about to kill , when he tries to pull off a speech like this trope, saying she'll be just like him if she kills him. However, unlike other examples, this isn't portrayed as a real moral dilemma so much as just 's cowardly attempt to save his own life.   considers his argument, admits he's completely correct, then kills him anyway. His death is karmic in the sense that he had tried to make himself a prisoner of war so he wouldn't be shot, when  causing the good guys to rebel against him in the first place.
 * This was the whole plot behind Guile's ending in the Street Fighter II game. He wants to kill Bison to avenge his friend Charlie's death, then his daughter Amy and his wife Jane dissuade him. Note that the wife was more concerned about Guile killing Bison in cold blood than asking him to come back home, until the daughter chimes in.
 * Subverted at the end of the game Dark Forces II: Jedi Knight after the final battle between Kyle Katarn and Jerec.
 * In Star Wars The Force Unleashed light side ending.
 * Another Star Wars example is Knights of the Old Republic for Juhani and Carth's quests. Xor is a disgusting slaver who . Saul Karath was Carth's former commanding officer who betrayed the Republic and carpet-bombed Carth's homeworld. After defeating them, you can encourage them to "finish the job," or invoke the trope.

We're just defending ourselves! You murdered your girlfriend in her sleep."


 * Commander Shepard of Mass Effect can address this subject on at least two different occasions:
 * After helping resident Cowboy Cop Garrus Vakarian track down a Mad Doctor who'd previously escaped justice, Shepard can either encourage Garrus to just shoot him, or persuade him to arrest the doctor and bring him in to stand trial. If the player opts for the latter, Paragon Shepard uses the Gargoyles explanation, adding that while they can't always predict other people's actions, that doesn't mean they should stoop to the same level.
 * Somewhat subverted:
 * In another instance, Shepard confronts a soldier at the end of a Roaring Rampage of Revenge against the Mad Scientists who used him as an unwilling test subject, and again has to choose between encouraging him to finish the job or persuading him to let the law handle it. In this case, Shepard has the third option of "let me kill him, because I can get away with it legally and you can't."
 * If you don't bring the  back to   in Imprisoned, your character has one of these moments after , and.
 * In Warcraft III, Uther the Lightbringer warns Arthas that "vengeance cannot be part of what we must do. If we allow our passions to turn to bloodlust, then we will become as vile as the Orcs". This is proved right as Arthas becomes obsessed with destroying Mal'ganis and upon defeating him with Frostmourne, becomes the commander of the Undead Scourge, who ironically replace the orcs as the antagonists of the series.
 * In Call of Juarez: Bound in Blood, William tries to prevent Ray from killing an unarmed bad guy with this and the story of Jesus forgiving one the murderers crucified alongside him. Ray's reaction? "The Lord forgave him... a cold-blooded murderer? Well, that's good to know." * shoots the baddie dead*
 * Played straight in Persona 3 when tries to kill  as revenge for . The response is along the lines of "If you kill me, you will be just like me", though he's more referring to the guilt  would feel from killing than the crime he would have committed. Of course,  is still fully prepared to die. Not that it matters because  is righteous enough that he believes killers shouldn't live so he plans on killing himself after doing the deed, which  immediately protests when he finds out. However, Strega interferes and it goes downhill from there.
 * Also played straight in Shin Megami Tensei: Devil Survivor with Keisuke when the party tells him that by letting Yama kill people considered "evil", he's just guilty as them.
 * Used rather cleverly in Diablo: killing its human host doesn't affect Diablo at all, so the hero tries to imprison the Lord of Terror in his own body. It doesn't work, and by the end of the second game he literally becomes Diablo.
 * Attempted by the preacher in Gun as he's pleading for his life, but subverted by Colton White in a Talk to the Fist moment.
 * Used in Oni: at the end of the penultimate mission, Konoko is given the choice of killing or sparing, with this trope hinted at.
 * In Rosenkreuzstilette,.
 * In the Fallout: New Vegas DLC "Honest Hearts", siding with Joshua Graham and his quest to destroy the White Legs tribe (the villains) will end with him about to execute Salt-Upon-Wounds, the war chief of the White Legs and a man who's committed countless atrocities. You can then stop him with this argument. Interestingly, after you've talked Joshua down, you can kill Salt-Upon-Wounds yourself.
 * Going with Graham and then convincing him to spare Salt-Upon-Wounds' life is essentially the closest to the Golden Ending that you can get with the DLC (although being a Crapsack World there really aren't any true Golden Endings). The Sorrows lose their innocence, but at the same time they realize that they can be strong without being like the White Legs. At the same time, this ending is the only one in which Graham finds a measure of peace in his life for the first time since his days in the Legion.
 * Final Fantasy XIII-2 has Noel Kreiss, who is constantly struggling with this when it comes to the villain Caius Ballad, who wants Noel to kill him. "Noel, born at the end of days. You understand the true meaning of life. But know this: you will kill me, Noel."

Webcomics

 * Subverted in It's Walky! In the final battle, Head Alien tries to pull this on Sal, who kills him anyway.
 * Parodied in the Sluggy Freelance story arc "That Which Redeems." When demons invade the Dimension of Lame and start eating and killing people for fun, most people still feel that killing demons would make them no better than demons. Unfortunately, when Torg tries to organize a human resistance, he discovers most Dimension of Lame residents think stubbing demons' toes or throwing pies also makes them as bad as demons. Torg ignores their protests and cuts demons into little bits anyway.
 * Inverted in Gastrophobia, where the protagonist Phobia is nearly killed by a deer-turned-monster attempting to avenge his mother (who Phobia killed six years ago). But upon seeing that Phobia is herself a mother, the deer can't bring himself to kill her.
 * Played straight in Shadowgirls when Paul stops  from killing , even if he has more reasons to see him dead as anyone else, because as a police officer he would have to arrest a killer.
 * Invoked in Everyday Heroes when Mr. Mighty stops Jane from killing.
 * In Goblins, this is the implication for why  is still alive to make Minmax and Forgath plot-relevant again.
 * In Kagerou, this is Fuuka's reason for stopping.
 * In General Protection Fault, after Nega-Nick is captured, Nega-Trudy expresses a desire to kill him, but Nick tells her that it would make her no better than he is. Nick then goes on to say that his experience in the universe taught him about opposites (as he earlier admits, Nega-Nick is what he might have become), and killing Nega-Nick would easily put her on the same dark path as her prime counterpart.

Western Animation
"Burns: Don't kill me!
 * Spoken by Elisa to Goliath in the premiere of Gargoyles, as Goliath held the villain David Xanatos over the edge of his own building (although she compares the act to something the other main villain, Demona, would do).
 * The show elaborates in another episode, saying killing someone in the heat of battle was all right, but attacking a defenseless enemy with the direct intent to kill was wrong.
 * Goliath has to relearn this lesson alot, as there are a number of occasions after Xanatos where he almost kills someone in blind rage but is talked out of it.
 * Subverted in an episode of Mighty Max. Norman is facing down a rival barbarian who killed his family. The bad guy uses this line because it's the last card in his deck. Norman smiles and says "I can live with that", then knocks him off a cliff.
 * Used in the Dungeons and Dragons episode "The Dragon's Graveyard", where Hank refuses to finish Venger on the grounds that if he did, "We'd be no better than you are."
 * Subverted in Batman: The Animated Series. When Catwoman is about to drop the villain into a vat of acid, Batgirl calls out "If you drop him you'll be just like him." Catwoman replies, "Grow up" and lets go.
 * Appears once in the 2003 TMNT, when Angel stops Casey from killing Hun, but the rest of the series says it's okay to kill villains, and in fact the turtles do kill (or sort-of-kill) a number of villains during the series.
 * In Batman: Under the Red Hood, Batman explains that the reason he didn't kill the Joker after the latter killed Jason Todd was that if he went there, he'd never come back.
 * Used three times if not more in Beast Machines. One is when Optimus Primal was thinking of using the Plasma Energy Chamber to destroy Megatron and everything else technological on Cybertron, in order to stop his tyranny. Cheetor flat-out tells him "You fire this thing, and you're no better than he is!". Another time is after Botanica joins the Maximals and uses it as her justification to not get involved with the actual fighting: "The more we fight like Megatron, the more we become like Megatron". Fortunately she realizes that it's also her world and her fight, so she joins the battle in time to save the others from Obsidian and Stryka. A variant, though not actually about killing, when
 * In The Simpsons, the episode "The Curse of the Flying Hellfish" has Burns sending assassins after Abe, trying to drown his grandson, etc... and yet, when Abe has Burns cornered...

Abe: I ain't gonna kill ya. That'd be cowardly. Monty Burns cowardly. I just wanna watch you squirm."

"Toyman: What are you gonna do to me?
 * In the episode "Hereafter" of Justice League, Superman appears to be killed by Toyman when performing a Heroic Sacrifice.

Wonder Woman: I'm gonna punch a hole in your head.

The Flash: We don't do that to our enemies.

Wonder Woman: Speak for yourself.

Flash: I'm trying to speak for Superman. [She releases him]"


 * When Big Barda is ready to kill Granny Goodness, Martian Manhunter stops her. Interestingly, he only says that the Enemy Civil War needs to continue and does not mention this trope.
 * In one episode of The Venture Brothers, The Monarch actually invokes this on tattling so Dean won't spill the beans about breaking into Dr. Venture's lab just to screw around. And it works.
 * In The Smurfs episode "For The Love Of Gargamel", Papa Smurf tells his little Smurfs that leaving Gargamel and Azrael in their self-petrified state would make themselves no better than their enemies. It ends up becoming the justification for many a Save the Villain moment in the cartoon show, despite how ungrateful Gargamel ends up being.

Real Life

 * This is a common argument against the death penalty, and that's all that needs to be said about this issue.
 * Suffice it to say that this trope appears in debates over the use of violent measures in combating terrorism, and leave it at that.
 * Before that, there was 'Nam, and again, that's all we'll say.
 * Basically, any time anyone kills anyone when it's not the result of a fight for purely self-defensive reasons, someone is going to bring this up.
 * Even in self defense, people will bring this trope up, and you know the drill.