I dont think there is sunch a thing as plain good or evil for no actual reason. What make us is our experience.

What im going to say next isnt proved but it's what i think.

I beleive when someone is born they get a part of the result from some important experience that been lived within many generation.

There is actual proof that a child can inherit gene that wasnt affecting anyone in the family for many generation. I remember something about a kid being black and the only black member of the family was actualy 6 generation before the child. Im sure there is some theory that would support the child receiving result of experience but i highly doubt there is any actual proof that would say if it's true or not.