Does anyone remember that movie they did years ago called Lord of the Flies? It's about a bunch of young boys who get stranded on an island. With no adults there to tell them what to do, they quickly digress into savagery. One description of it was: "...Evil is inherent in the human mind, whatever innocence may cloak it..."
I hate to say it, but I think if we were left to our own accord as children, we would definitely become evil alot sooner than we'd become good. While I think we're capable of both, it seems that evil rises to our consciousness alot swifter than "good" does.