One time I asked my father, who was super laid-back, if he believed in evil. We'd been watching the TV news when an awful story came on about some guy who went to a crowded movie theater and started shooting everyone, people he'd never met before, even kids. The lawyer for the shooter said he had severe emotional problems (which was, like, no kidding), but in my mind, that didn't account for how and why he devised a plan so awful and cold-blooded. And I remember Dad mulling my question for a few moments before saying that true evil was rare, but, yes, it was real. He also said that it didn't occur in any other species besides humans, and I believe he was right. Violence and brutal domination exist in the animal world as a means for survival, not as sport or sick amusement.