system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Joker's Philosophy (in the dark knight)
gpt
The Joker went crazy after a seriously screwed up personal loss ( nightmare level stuff) and he tries to break people down morally so he can prove his point that given a certain situation, anyone will be as crazy and "evil" as he is. He does this by terrorizing them and putting them in horrifying, impossible situations. He does this several times in the Dark Knight film: on his two new henchman ( kill each other, winner joins me), on the people ( blow up the other boat or get blown up) , on Batman ( choose who will live or die). He also did this to James Gordon in the award winning comic  "The Deadly Joke". Why is this so important? Because Batman is the one the Joker HASN`T been able to break down morally. Despite everything the Joker has done, Batman has never killed him. If Batman kills Joker, the Joker WINS. And Batman knows it. They`re both struggling to prove their principle is the valid one and to prove that the other has a wrong view of the world. This is why their fight is so important, so chemical, and has lasted so long. It`s a very very personal struggle.