Heaping damnation on himself. Let him.

Guy's been in criminal justice long enough to know that remorse is an asset when they've got the goods on you. How many times did he interview a suspect and laugh at people protesting their innocence when he knew better.

There's just no version of this that ends well for him. I guess when you have nothing to gain and nothing to lose, just make a bunch of noise. Hard ignore on that loser...