Hmm...

[ They're tempted to ask when the man hates himself, but perhaps they should at least be something approaching tactful in their questioning. ]

I'd say that murdering people doesn't have to cause guilt, but it does depend on the personality - there are some out there who don't quite shake the feeling. Though, I wonder if you always felt guilt if there was someone particularly bad enough.

[ Ah well. That being said.. ]

Is that something you still do back home? Oversee Hell?