Ooohhh...bizarre fandom merging with reality question.
I've been reading up/researching for a post on the death penalty and whether or not Christian's can support it. That'll come later. Anyway, while I was thinking about this stuff, I was contemplating...would anyone argue that the preemptive death of certain people would spare the lives of thousands and perhaps millions of others? Or even just a dozen lives, spared by the death of one evil person? Think, Hitler, Mussolini, Nero, Jim Jones, David Koresh, Ted Bundy, John Wayne Gacy. All the people dead because of them, alive.
Of course, anyone familiar with scifi then comes up with the problem - but you can't know the entire effects of your actions. Butterfly effect. Step on a bug in the Paleozoic Era, come back to a future where dinosaurs run the Earth. The death of one mass murderer or serial killer could allow someone even worse to rise up, or cause a hero not to be born or develop. Even harder, what if the death of one innocent person could prevent horrors? For to the instance: next week's Supernatural involves one of the angels, Anna *boohiss* going back in time to kill Mary and John Winchester (Dean & Sam's parents) because if they die before Dean and Sam are born, no Apocalypse. (Yes, the angels can travel through time - apparently DeLorean's are Standard Angel Equipment. And yet I'm pretty sure Castiel can't drive a car...)
And yes, that *is* the train of thought my brain took.
*Everything* is relate-able to Supernatural. *EVERYTHING*!
Also StarTrek. But that kind of goes without saying.