well... I don't think there's any justification for anything evil... but there's a whole lot of blame game... you blame it on someone and that someone blames it on somebody else, a person who hasn't felt the need to lie to himself will accept that his evil is a part of him... for others it's the pillow passing blame game
I know :v
But the characters in the story don't have to know it.. otherwise where is the fun XDD
you already completed your story and now the rest of us will be filling in
Be my guess, let the imagination run wild :v