He exists to prove Batman’s moral code is a delusion.
He rejects money and power for pure ideological destruction. He exists to prove Batman’s moral code is a delusion
If you'd like to dive deeper into specific elements of this analysis: He views Batman as an incomplete version of
(The Interrogation, The Magic Trick, The Hospital) Thematic comparisons (Batman vs. Joker philosophy) Acting techniques (Ledger's method and performance style) everything is corruptible
The most profound element of the Joker’s arc is his relationship with Batman. He does not want to kill Batman; he wants to prove that Batman is just like him. In the chilling interrogation scene, the Joker explains that to the "civilized" people of Gotham, Batman is a freak who will be cast aside the moment he is no longer needed. He views Batman as an incomplete version of himself—someone who has looked into the abyss but refuses to embrace the madness. By forcing Batman to choose between saving Rachel Dawes or Harvey Dent, the Joker successfully breaks the one thing Batman cannot protect: the spirit of Gotham’s heroes.
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The Joker’s power lies in his absolute unpredictability and his rejection of conventional motives. In his first appearance, the bank heist, he orchestrates a series of murders among his own crew, revealing a Darwinian ruthlessness that values nothing, not even loyalty. When he later burns a literal mountain of cash, he delivers the definitive thesis of his character: "It’s not about money. It’s about sending a message." This message is that everything is burnable, everything is corruptible, and the structures society relies on for safety are nothing more than a "bad joke." By operating outside the "schemes" of the mob and the laws of the police, he becomes an unstoppable agent of entropy.