system
Given the following post, respond as if you're commenting on Reddit:
human
[Batman] How has The Joker just not been killed by the cops yet?

I understand Bats and other heroes not killing him, but why hasn't any of the cops?

The GCPD has a severe problem with corruption, with almost every other cop being on some sort of criminal payroll, or having some other kind of illegal side hustle. This is has improved since the rise of Gordon and The Batfamily, but it's still prelevant. The murder of criminals or just straight up innocent people almost certainley happens from time to time.

And cops, both honest and dirty, have a sense of brotherhood around each other. It's why cop killers get pursured so agrressively, and why dirty cops are so difficult to convict: Their collegues are hesitant to report/testify against them.

The Joker has murderd countless men, women, and children, including *cops*. *No one* is safe from this guy. Even if he has some dirty cops on his payroll, he kills his own henchmen all the time, or atleast is directly responsible for their deaths. They're not safe.

And yet time and time again he gets off because of the insanity plea (which is bullshit but that's a different post for another day.) And gets shoved back into Arkham only for him to escape a week later with a trail of bodies behind him.

Why hasn't a cop or ten just decided "Fuck it" one day and shot him while he's in custody? And then Blue wall of silence througout the entire trial? Even if they get convicted the sentence would probably be pretty light and many would see them as a hero.
gpt
A cop shot Joker in the head one time and he just kind of woke up later in Arkham.

Red Hood shot him repeatedly but it turned out to be a dummy that releases Joker gas when you shoot it.

Jim Gordon shot him on the chest but it turned out he (at the time) had a healing factor.

Batman also attempted to kill him by trapping Joker and himself inside a collapsing cave, but they both got better.

Recently, Batman left Joker to die with a bomb that Harley setup but later he finds that Joker disarmed the bomb.

So people attempt to kill Joker all the time, but through numerous reasons they don't succeed.