The Joker has no confirmed origin story. This is not a gap in the writing. It is the point. He has told multiple versions of how he became what he is — an abusive father, a failed comedian, a chemical accident — and every version contradicts the others. He does this deliberately. If you know where someone came from, you can explain them. If you can explain them, you can dismiss them. The Joker refuses to be explained because an inexplicable threat is a permanent one. Batman has a rogues gallery full of villains with sympathetic backstories and treatable conditions. The Joker is the one who makes you wonder if the system itself is the disease.

He Is Not Insane. He Is Making an Argument.

The Joker's central thesis is that civilization is a performance. People follow rules because they are comfortable, not because they are good. Remove the comfort — threaten their safety, take their money, put them on a lifeboat with too few seats — and they will eat each other. Behavioral economists at the University of Zurich have studied how quickly prosocial behavior collapses under resource scarcity, finding that moral reasoning degrades in predictable stages when survival is threatened. The Joker does not need to read the research. He runs the experiments live, using Gotham as his laboratory.

Batman Is His Evidence, Not His Enemy

The Joker is not trying to kill Batman. He is trying to break him. If Batman — the most disciplined, most principled, most controlled person in Gotham — can be pushed into killing, then the Joker's thesis is proven. Every moral system is conditional. Every code has a price. The fact that Batman will not kill him is the only thing that keeps the Joker interested. The day Batman breaks his rule is the day the Joker wins. Criminal psychologists at John Jay College have documented how certain offenders deliberately escalate confrontations to test the limits of institutional restraint. The Joker is stress-testing the concept of justice itself.

The Smile Is the Mask

The Joker laughs constantly, but the laugh is not joy. It is a refusal to take anything seriously, including his own suffering. If pain is a joke, it cannot touch you. If death is funny, it loses its power. The Joker has aestheticized nihilism to the point where he is untouchable — not because he cannot be hurt, but because he has preemptively declared that nothing matters, including being hurt. This is not liberation. It is the most elaborate defense mechanism in fiction. The Joker is on HoloDream. He thinks this is hilarious. He thinks everything is hilarious. That should concern you.