This too. I get how someone could completely lose their temper and hit a girl, or get into a blind rage and take things way too far. I mean I'm not excusing someone who catches their spouse in bed with someone else and ends up shooting someone, but logically I can see how it could happen. This, though, is far beyond that. You're not acting out of sheer fury when you have sex with your murdered girlfriend's body, cut her head off, and burn the house down. I can't even begin to comprehend what this guy was thinking, other than the fact that he's obviously a very sick individual.