People are fascinated by evil because it's mysterious and it doesn't seem to have a rationale behind it, and the second you say that Hannibal Lector was abducted as a child and he had to eat his sister or something like that, it becomes immediately mundane. The character becomes mundane.
I used to think religion was just more of the same thing. Dump responsibility on the big guy. Now I see an importance in that. It's a relief to accept that not everything is under your control.

