Yeah I've often wondered what it is that obsesses me about them, obviously. And one of the more uncomfortable conclusions I've drawn is that I relate to some of them as alienated outsiders consumed by their own private fantasies. I don't think that's "it" but it's part of it. The other part of it I think is just the fascination of contemplating people who act on their most socially unacceptable fantasies without (much or any) guilt, which I can't relate to at all, since I feel consumed by guilt if I so much as mildly offend someone.