you win the interwebbs!Genghis Khan has 16,000,000 male descendants. Should you kill him? How about Vlad The Impaler?
You could kill plenty of genocidal maniacs, like Hammurabi, Cyrus, Alexander, ETC.
Wouldn't you have a moral obligation to hop scotch through history smothering infants in their cradles?
When your work was done, and you came back to the present, you might not even find a place for yourself.
YOURSELF? Snap out of it , man. It isn't all about you.