The Joker truly really wants to corrupt Batman by leading to higher tragedies in his lifetime to ensure he may get Batman to destroy him or make Batman like him. Though the Dark Knight has revealed to get incorruptible and sticks to his ethical code of not murdering his enemies http://slotjoker87653.blogkoo.com/the-fact-about-joker-slot-that-no-one-is-suggesting-23345666