How should the Joker be Defeated ?

Ok, I don't know if this will make any sense whatsoever but I think what the joker needs in order to be "defeated" is for batman to stop caring, no matter the cost. That'll drive him to actual insanity. Jokers like a child on a playground at first he's annoying and tu hit him back and scream, but the minuto tu ignore him he quiets down. It'd be like having a piece of himself removed. batman is what keeps him alive after all. Sorry i haven't really read all the comics so if batman already did this and failed i didn't know. and in regards to who is a better character, joker win por a mile, theres no competition, he's a real jokester (pun intended)