A Swiftly Tilting Planet/Headscratchers


 * Having read the book, I understand the following. Matt, who had presumably died of his illness in the original timeline, remained dead without children. Bran, who had married Zillie in the original timeline, now married Zillah. Gwen, who had married Gedder in the original timeline, now married Rich (whom Gedder had originally murdered). My question: where did Chuck and Beezie, and their father come from? All the Maddoxes and Llawcaes in the 1865 arc were either dead without descendants, or married completely different people, altering their bloodlines forever.
 * There seems to be some heavy In Spite of a Nail going on with respect to specific people, in that even if you change who someone's great-great-great-grandparents are, they still end up being basically the same person (unless they're not, like Madog Branzillo, although it's hard to tell what the extent of the change there was. He could be an entirely different person who coincidentally has the same name and office, or he could be the same person with a different temperament). There might also be some form of You Already Changed the Past although obviously that can't be applied to every part of the plot.
 * Why exactly is it a good thing for Charles Wallace to stop Harcels from learning about violence? If he was going to survive and his people would spread it might help but Gaudior implies that the entire tribe was later wiped out for their pacifism. It's entirely possible that Charles Wallace accidentally caused their genocide by preventing them from learning how to defend themselves.
 * It seems to be more that Gaudior wants Harcels and his people to do a culture-wide Dying as Yourself rather than see them be corrupted into learning the ways of violence and war.
 * So Gaudior has decided it is better for these people and their entire culture to be completely destroyed, precluding the possibility of them helping others or stopping other genocidal groups in the future, than for them to realize that they could use force to protect themselves. The 'good' option is for these people to be killed off. That's a heck of a case to make in a world where genocide has been stopped by force and the world seems to be a bit better for it.
 * So by making sure that certain people win or survive Charles Wallace is helping alter a man from a military dictator into a peace activist. Is this book encouraging eugenics?
 * Seems to be more of a Set Right What Once Went Wrong, as Gaudior implies that the book actually starts in a timeline caused by a Might Have Been that the Echthros almost made come true.
 * Except that everything that sets things right involves making sure that the right person went on to have children. One of the pseudo-psychic characters even states at one point that it's 'wrong' for the people of one bloodline to mix with the people of another bloodline. We are effectively being told that if only a certain men had married the love interest instead of the other bad person hundreds or thousands of years ago the world would have avoided nuclear war in the late 20th century.