View source for Can't Kill You - Still Need You

{{trope}}
When one person spares the other's life (despite ''really'' wishing to kill him on the spot) because he intends to use him later.

One response to [[Get It Over With]]. If a lesser villain is [[Genre Savvy]], he may make sure his boss always needs him, lest he [[You Have Outlived Your Usefulness|outlive his usefulness]]. Can also prompt [[Stop or I Shoot Myself]] to put the boss at a disadvantage.

Can apply to both [[The Protagonist|good]] and [[The Antagonist|bad]] guys. Compare to [[Enemy Mine]]. Contrast [[You Have Outlived Your Usefulness]]. Compare/contrast [[Sympathy for the Devil]].
{{examples}}

== Anime and Manga ==
* The villains in both incarnations of ''[[Fullmetal Alchemist]]'' need the Elric brothers alive to fulfill [[Powered by a Forsaken Child|their respective]] [[A God Am I|master plans]].
** Likewise, the Elrics end up needing  {{spoiler|Scar's Brother's Brother: Scar}} in the manga for his literacy skills in order to decode  {{spoiler|Scar's father's son-who-is-not-Scar}}'s counterplan to the villain's master plan.


== Film ==
* The first [[Pirates of the Caribbean]] movie has Jack and Will steal a ship, then fight when Jack tells Will his father was a pirate. Jack gets Will down with a sword to his neck, then reverses the sword, admitting he needs Will to sail the ship.
{{quote|'''Jack Sparrow:''' "And me, for example, I can let you drown, but I can't bring this ship into Tortuga all by me onesies, savvy? So, can you sail under the command of a pirate, or can you not?"}}
:* Later in the film, Elizabeth burns all the food, the shade, and the rum to signal a passing Royal Navy ship. Jack pulls out his pistol in a rage to shoot her, but stops himself. In order to reclaim the ''Black Pearl'' and rescue Will, he will have to smooth-talk his way onto another ship. Which, thanks to Elizabeth, will be a ''Royal Navy'' ship. Shooting Elizabeth would remove the only thing keeping them (or Will) from executing him on sight, as well as waste the one shot he's been saving for Barbossa.
:* It should be noted that it's an established part of Jack's character that he's reluctant to kill, which hampers his effectiveness as a pirate. He may stab people in sword fights or shoot the man who marooned him (who, it should be noted, was in combat with him at the time), but straight up executing Elizabeth isn't really in his nature. It was likely a sort of [[Black Comedy]].
:* In ''At World's End'', Jack tricks Beckett into thinking this by telling him he can convince the other pirates to meet Beckett's armada head on rather than holing up in Shipwreck Cove.
* Sort-of used in Disney's ''[[The Hunchback of Notre Dame (Disney film)|The Hunchback of Notre Dame]]'', though the main reason Frollo can't kill Quasimodo as a baby is that the Archdeacon caught him trying and guilt-tripped him out of it. He does, however, state that he's going to find a use for the "foul creature."
* In ''[[Street Fighter (film)|Street Fighter]]'', this is why M. Bison allows Dhalsim to live after Dhalsim makes the mistake of pressing Bison's [[Berserk Button]] by calling him psychotic.
* In "Abandon Ship" there are too many survivors for the one lifeboat. Most of the people are left clinging to the outside of the boat but the captain allows one passenger to pull his huge dog in. The dog's owner is incredibly grateful but another survivor demands to know why the dog gets in while he doesn't. The captain's answer was "If we're not picked up immediately we could be out here for a long time. If that happens, we can't eat ''you''." Cue the horrified look on the dog owner's face.

== [[Literature]] ==
* Happens more than once in ''[[Duumvirate]]''. The biggest example is when William wants revenge on [[Evilutionary Biologist|his creator]] for enslaving him to his own brother, but this trope kicks in instead.
* ''[[The Lord of the Rings]]'': The dynamic between Gollum, Sam, and to some extent, Frodo.
* In Max Barry's ''Machine Man'', the [[Corrupt Corporate Executive]] Cassandra Cautery has this in mind for {{spoiler|Dr. Charles Neumann}}. She plans to keep him alive so Better Future can calibrate its weaponized parts for [[Super Soldiers]].
* In the ''[[Warrior Cats]]'' series, the [[Big Bad]], Tigerstar, decides to spare Featherpaw and Stormpaw because he thinks they may still be useful to him. (Presumably as hostages, since they're the children of his enemy's best friend.)
* This is Mara Jade's opinion of [[Star Wars|Luke Skywalker]] in ''[[The Thrawn Trilogy]]''. She wants revenge for the death of her old master, the Emperor, but always finds herself relying on him for survival or some other more immediate problem. {{spoiler|She eventually excises these homicidal urges by killing his [[Evil Twin|Evil Clone]] instead.}}
* In the second book of the ''[[Chaos Walking]]'' trilogy, the protagonists finally have the [[Big Bad]] at their mercy. Then,  {{spoiler|the native species of the planet launch a war}} against all humans, and they realize that they need him to command his army in order to survive.


== Live Action TV ==
* The main plot of season 4 in ''[[Breaking Bad]]''. {{spoiler|Gus}} can't kill Walt and Jesse because he has no one else to cook meth.
* ''[[Fringe]]''
* Spike pulls one of these in one of the earlier ''[[Buffy the Vampire Slayer]]'' seasons, when he needs Angel to heal Drusilla.
* In ''[[Supernatural (TV series)|Supernatural]]'''s seventh season, {{spoiler|a [[Well-Intentioned Extremist|slipping]] Castiel}} does this to Crowley.


== Video Games ==
* ''[[Dragon Age]]: Origins'': If you already know the final [[Reveal]] ({{spoiler|that one of the Grey Wardens in your party must perform a [[Heroic Sacrifice]] after the [[Final Battle]]}}), this may become a motivation to spare the life of {{spoiler|Teyrn Loghain}} and instead recruit him to the Grey Wardens. Riordan tries to argue in favor of doing so without publicly stating why.
* ''[[StarCraft II]]'': It is revealed that  {{spoiler|former [[Big Bad]] Kerrigan is needed to stop a [[Bigger Bad]]}}.
* This is the standard Paragon outcome to Zaeed's quest in ''[[Mass Effect 2]]''. If you've already completed the final mission at this point, however, you can leave him to die instead.
* ''[[Fable III]]'': If you choose to spare Logan in the third game, the Hero Prince explains that "now is not the time for revenge.", politely asking for his brother's help. A kind way of putting it- you spare Logan because you need his built-up military to assist you.


== Web Comics ==
* [[Dominic Deegan]] includes a couple of these. Notably, Evil Necromancer older brother Jacob including 'don't kill Luna' as a major part of his demands when negotiating with the Shindula, simply because he expects to get some use out of her...for now.
** Of course, he has his [[Heel Realization]] and saves her just 'cause at the end of the arc. "Don't say I never did anything for this family."

== Western Animation ==
* In the final episode of the first season of [[Young Justice (animation)|Young Justice]], Vandal Savage notes this about  {{spoiler|the Justice League}}, explaining that they are still needed for Phase Two of the plan,  {{spoiler|mind-controlled or not}}.
* Evoked by current [[Big Bad]] Amon in ''[[The Legend of Korra]]'', ridding the new Avatar of her ability to bend and killing her at this stage of the game [[Dangerously Genre Savvy|would only create a martyr]] so he fully intends to face her ''last.''
* In ''[[X-Men (animation)|X-Men: The Animated Series]]'', the extra-dimensional villain (and movie producer) Mojo is ranting about how his henchmen can't seem to apprehend Longshot. Spiral gets upset and snaps at him, suggesting he go find Longshot himself. Naturally, this enrages Mojo even more, and is about to kill Spiral; however, [[The Dragon|Major Domo]] - always the [[Straight Man]] here, it seems - points out to him that leading an invasion of Earth might [[Slave to PR| gain footage for a new smash hit]], and also quickly points out that Spiral is the one who enables him to transverse dimensions at all. After [[Glad I Thought of It|stating how glad he is that he thought of that]], Mojo lets Spiral live.

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[[Category:Morality Tropes]]
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