Lyric discussion by Hydra2 

I am going to us the Hannibal Lector example again (used in may comment for Handlebars by The Flobots) for this song. In the book, Silence of the Lambs, Hannibal makes Agent Starling almost comfortable, like she can trust him. He acts like a gentleman, but we all know the horror that he is able to unleash. David Byrd is Pretty much conveying this message in Psycho Killer, as long as you look at this song in the exclusively literal sense.

@Hydra2 David who?

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