Difficult one. I can understand why he still has immunity. Ultimately if he's exposed to the public then it'll cost everyone else a fortune trying to keep safe. Someone would do him in. Then they end up in jail for being a vigilante. What would exposing him really achieve? There's lots of things the public don't really need to know about.
He quite clearly isn't safe. He must be one seriously ****ed up individual.
The whole thing is very, very sad and disturbing.