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.
“If you don't have liberty and self-determination, you've got nothing, that's what this is what this country is built on. And this is the ultimate self-determination, when you determine how and when you're going to die when you're suffering.”