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Given the following post, respond as if you're commenting on Reddit:
human
[DC] Can the Joker be made sane?

In the comics, the Joker briefly becomes sane on two occasions - once after entering the Lazarus Pit, and once after being aided by Martian Manhunter. These instances only grant him temporary sanity, after which he reverts back to his sociopathic self, but his time spent in the realm of the sane shows him deeply regretting his crimes.

Is there any known way to permanently "fix" Joker, or is he irreparable?
gpt
In Kevin Smith's arc, at the tail end Joker is restrained and doped up with anti-psychotics. In the doctor's words he's as sane in that moment that he's capable of being. Batman has a conversation with him in this state. The Joker says that what Batman fails to understand is that he doesn't hate Batman because he's crazy. He's crazy because he hates Batman. He suggests that if Batman were to die, he'd call it quits, and go about his day to day existence as plainly as anyone else. Something about Batman is deeply disturbing to the Joker. At a guess, it's that a man can put on an outfit and persona, and act out a power fantasy instead of confronting reality, and the world will give him a pass, as long as what he's doing is convenient. More basically that mental unhealth or insanity is permissable under a set of circumstances. The Joker acting out may be an attempt to accomplish one of two things-- either forcing Batman to kill, at which time his activities would no longer be permitted, or force Batman into a place where he has to confront his own mental issues. That these things have not happened -- maybe this is what drives the Joker insane.