I think A Bad Man Happy would make a great title for a movie or play.
For what could be more sinister than an evil person delighting in their vile (and not even aware of it).
God whispers to us in our pleasures, speaks in our conscience, but shouts in our pain: it is His megaphone to rouse a deaf world. A bad man, happy, is a man without the least inkling that his actions do not ‘answer’, that they are not in accord with the laws of the universe.
-C.S. Lewis, The Problem Of Pain (Amazon)