Batman knew Joker would live, which means he just walked away knowing full well Joker would escape and be free to kill more people lol. It's just sad at this point. Batman's moral standards are completely useless if he DOESN'T DO ANYTHING to even attempt to fix the Joker problem. Body count's gotta be what, five digits at least? What coherent moral argument is there for the way Batman treats Joker like an old friend? It's just ridiculous.