People who have normal private opinions and guilt and other feelings often react in odd ways. The reaction of some people to hearing awful news is often to say something totally irrelevant and silly. Some laugh wildly. But these people are reacting to their internal feelings. The psychopath has learned to do without such feelings.
Psychopaths have no such distractions, and their reactions are right, perfectly right.
The psychopath has spent his entire life learning how to react correctly. He is the perfect citizen of the sound bite age. He is the absolutely perfect lawyer in a society ruled by lawyers. He is the perfect big time preacher. He is the perfect talk show guest.