I couldn't Karma hit you on the comment about pedophiles ... I know at least two people who were molested as children. Neither of them are pedos but they're what I call "damaged goods." It's so difficult to overcome your normal, everyday dysfunctional childhood, sex abuse, particularly from your parent, takes things to a whole other level.
I believe pedophilia, like any other horrific crime, is sort of a combination of nature/nuture. They are born loaded guns, the abuse gives them the bullets.