*sighs, adds a tick to his personal Phail Count, and caves in*
Batman isn't a doctor. He can't do anything for any of the people he attacks except leave them where the police will retrieve them. When they are retrieved, they (presumably) will receive proper medical care by trained professionals.
Furthermore, imagine if Batman wasn't around. The crazies run loose, kill and maim innocent people via their own agendas, and then the police are forced to confront them instead of Batman. When these confrontations occur, police officers are killed, criminals are killed, there are shoot-outs in the streets, there is collateral damage...
If you really wanna talk about a crime fighting ninja who is in it purely for his own sake and who blatantly disregards human life in the process, I direct you to
Doctor McNinja. The man is a fabulous doctor, yet numerous times he not only completely forgets to tend to those who are wounded, brutally kills people (and then laughs about it) as well.
That said, the exploits of the good doctor are pure hilarity, so that makes up for it.
-TLDR-
~Alja~