If only it were just him. But this happens so infuriatingly often. Like pic related. Or this scenehttps://www.youtube.com/watch?v=7kscfb9XzPs
I mean, fine, Batman can't bring himself to kill anyone because he's a mentally scarred manchild getting off on violence who would make excuses to keep murdering people if he commited murder once and he knows this, understandable. He says as much in that scene. And he especially can't kill Joker because Joker is his litmus test and because that's what Joker wants him to do, okay, that is understandable too.
But why the fuck does he have to go to such painful lenghts to save the Joker and deny people the chance to do what he can't do ? Especially if Jason or Punisher whoever else actually can kill Joker and cope with it mentally ?
Jason literally says in that scene that he doesn't want Batman to start killing everyone, just finally put Joker down. Or at least let him do it.