I haven't read the books, but the Hannibal character does touch on a theme I'm interested in, which is the primacy of aesthetic values. I have an article coming out within the next couple of weeks that goes into this further. It's called, "The Inherent Value of a Godless Universe."
The seemingly evil Hannibal Lecter challenges this posthuman, aestheticizing view of morality, possibly reducing it to absurdity. Can murder be beautiful? Mind you, I also consider whether we can still rationally justify our abhorrence of murder (after the death of God, etc.) in the article below.