The Joker wants to know if people are bound to break down and go mad in the face of dark moments, and Batman tells him that people don't have to break down, and they don't have to be "crazy" like the Joker. But even as hard as Batman, it is not necessarily more normal than the madness of the Joker's collapse. The two are madmen on opposite sides. The Joker wants Batman to "laugh", but he actually wants him to collapse. Batman wants to "save" the Joker, in fact He was so hard and hard, how could it be called salvation to be like him. The fate of the two is destined for the two of them, and Batman is as worthy of sorrow as the Joker. Everyone is destined to be sad in the face of a tragic fate, and trying to save them is very paranoid and naive. So what Batman and the Joker did is sad and ridiculous. The two knew it well, but it was fate, who could refuse?
PS Batman and Joker are different from ordinary people.
Batman holds on to the "crime" that caused the death of his parents, while the Joker holds on to the "impermanent, joke-like fate", and both of them are paranoid to madness.
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Batman: The Killing Joke reviews