@Vanguard-01.
I confess the only real exposure I have to DCU vampires is Alan Moore's Swamp Thing run, where they seemed like soulless abominations. But then I, Vampyre kind of screws that up.
DC really needs to sort out the ground rules for that. Of course, outside of Angel, I'm not wild about vampire redemption stories. I like them to actually be evil and scary, so reforming vampires doesn't really appeal to me.
Except no, because they're still human and protected by the law, and if Batman started putting stakes in their hearts Gordon wouldn't look the other way for him anymore and would be determined to throw him in Arkham himself.
I'm not really getting your stance here. You seem to have a problem with Batman taking the law into his own hands, but you also want him to just start killing criminals, some of whom are genuinely mentally ill? Or taking them away from the law and throwing them into a more secure facility of his own making or something? Because that sounds way worse than what he does already.