One of the biggest mistakes celebrities make is being overly friendly. They allow photo shoots in their homes, even their bedrooms and bathrooms; they send fans autographed pictures. All that serves to support viewers with a delusional relationship with the celebrity.

Our job should be like any other forensic scientist's - we should be truth seekers who are not partisan, who do not have any interest in the outcome, who call it as we see it no matter the consequences. But it seems a lot easier for chemists and anthropologists and pathologists to take that neutral role than it does for psychiatrists.

You condition a vulnerable boy at puberty to become aroused by brutality. It's the violence, not the nudity. Frankly, I wouldn't mind if every teenage boy had a subscription to Playboy. They'd be looking at attractive naked female bodies while they masturbated, not eviscerated female bodies.

I think people are inherently self-aggrandizing, pleasureseeking, unempathetic, self-serving, greedy and lustful.

I like to have success experiences rather than failure experiences. So I'm more likely to compete in things I'm good at, and more likely to spend time on the things I expect to succeed at.

I do think a lot of sexual violence stems from experiences in childhood or at puberty. Some people become sadistic after suffering early abuse at the hands of parents, relatives or friends. But for others, the seed is planted in the formative years by the conflation of images of violence with those of sexual arousal. Magazines, TV shows and, especially, slasher movies are masters at doing this.

With rare exceptions, people are responsible for what they do.