http://m.youtube.com/watch?p=PL35FE5C4B157509C9&feature=plpp&v=Mq8hGbeDvL8The only reason Batman doesn't kill Joker is because Batman is aware of his mental illness, which is the key factor that distinguishes him from the rest of his usual villains. Batman is conscious enough of himself to know that if he kills Joker, he will go about to kill every other supervillain on the planet. It's interesting that he fights the urge so hard, for when an alternate universe version of him finally killed all of them, it ushered in an era of global peace and prosperity. I'd personally kill Joker for the same reasons Batman fantasizes about killing him. The man is just a monster. In the Pre-52, the man killed the second Robin, crippled Batgirl, killed Gordon's wife, and is responsible for the deaths of thousands. Even other Arkham Asylum patients hate him. There's also no hope to cure the guy for he's so twisted, doctors diagnosed him with everything. He's a walking, talking DSM that also happens to enjoy murdering people and kicking puppies. Nothing less than an Act of God could cure this guy for more than five seconds...No, really. The Spectre, who is God's Wrath, was the only being to ever truly cure him.
Well, I really meant what I said.Just for future reference the point is not what or who batman is in terms of image, morals, etc. The question is if YOU were suddenly in Batman's position and had the opportunity to kill him would you? From what I perceive some of you are interpreting as "suddenly I'm batman, therefore I am everything batman including his morals."