Death.

[DeathsHand]

I think when people die they're dead and gone period.... There will always be people like Hitler and Saddam in the world because every once in awhile some crazy guy will come along that had nothing to do with the last crazy guy other than maybe idolizing them or trying to follow in their footsteps or what have you...

Rather simple...

Although I like to believe in the possibility of some sort of afterlife or ghosts or whatnot... Just because it's interesting, but unlikely...