User blog comment:X9 The Android/PE Proposal: The Batman Who Laughs/@comment-24758512-20190928160714

"he left himself to be consumed by the nano-toxin which slowly transformed him into the new Joker. Instead of searching a cure, Batman embraced the effects of the toxin an went to kill all his Bat-Family". Excuse me? Batman accidentally breathed the toxin and had his mind rewrote by it. It's a prime example of a brainwashed villain.

His insanity was sympathetic because of all the messed up and sick stuff Joker did to him, making him more of a tragic villain who became insane after a brutal and violent past. Not to mention, he fought the corruption, if he accepted it, it would be a different story.