I remember reading something, somewhere about a theory that years ago, when there was plenty of land still considered wilderness, that those of society that were considered, or considered themselves, outcasts, misfits, etc, went to live in those wild, untamed areas away from "polite, ordered society". It was like a release valve. They had somewhere they could go to be themselves and not "trouble" the rest of society.
Today, we don't have that. There is no "wilderness" for society's "misfits" to go. Their societal rage builds up and they pop, go "postal".
OK, it was for a psychology class and it was just a theory, but it kinda' makes sense, eh?