That's not the true ending...,
CAUTION: THE ENDING OF BATMAN ARKHAM CITY...
Joker ends up dying, but he is singing a song at the end of the credits, he could possibly be alive. However, that's not all. If you return to the still mill, where the Joker had his base of operations setup in, you'll see Harley's old suit. Keep looking on the ground by the suit, and you'll see a pregnancy test... Say what the...? That's right, Harley has Joker's love child in her, and she and her child are going to give Gotham, and maybe the world, hell for killing the Joker. Need more proof? Watch the end of the credits and you will here Harley Quinn singing the classic lullaby "...hush little baby don't say a word, mommas gonna kill the whole damn world..." Oh yeah, this means that Batman Arkham City won't be Rocksteady's last Batman game... Who knows what possibilities will enter the third game!?
If you read my spoiler block, you know its going to be super freaking awesome!
Replying to your question: the only reason that Batman didn't say anything is because Joker basically killed himself by attacking Batman... End of story.
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