Rigged for the rich and powerful right. What the hell kinda influence would a chaos agent like the joker have in such a system. Mobsters I can understand, the joker less so.
But he has the intelligence, money, and influence to pay/manipulate/break his way out.
He’s broken out of Arkham countless times.
If you kill a mass murderer the amount of mass murderers goes down. Killing someone who’s only killed one person is one thing.
Killing someone who’s killed as many as the joker is just solving a problem.