>>87360313I loved how it explores the justification for capital punishment
How the Joker does so many horrible things to people, including "killing" Robing, leaving Barbara Gordon a paraplegic, and murdering various people yet Batman always brings him to justice even though he knows he won't even go to real prison, he simply gets put in Arkham.
This starts a dialogue; is Batman actually doing the world harm by NOT killing the Joker? How many innocent lives have to be lost before it's enough?
This is also explored in The Killing Joke
Was the last panel the point where the Joker finally broke the bat and had done something so horrible that Batman decided to end him?
Or did Batman take him in "by the book" and he simply stopped laughing as he was dragged off?
It's open to interpretation but it's very heavily implied it was the former.