Why did the guy cut his face?
If I understand this correctly - the guy in the wheelchair with the disfigured face; got that way because Hannibal gave him a drug that both numbed him of pain and impaired his decision making ability to the extent that he thought it would be a good idea to cut his whole face apart with a piece of glass? What drug makes someone do that?
What was the relevance of him being a child molester? Why was this detail mentioned when it wasn't built upon in the story?