And all jokes aside two child molesters of obvious scum quality (both were serving life so not a minor item) are gone. And this guy who is a violent psycho will likely be kept out of society longer himself. It is fun to kid but someone that would do what he did will also kill/hurt people for non-good reasons.
It may feel like justice was done but that's not the way the system should work, street justice is incompatible with a lawful society. When the government removes your ability to flee or defend yourself then they owe it to you to protect you. If it can be done to someone you think deserves it then it can be done to others who don't. It's no different than defending the free speech rights of Nazis, it's distasteful but necessary to our society.