User blog comment:X9 The Android/PE Proposal: The Batman Who Laughs/@comment-4708882-20190928153530/@comment-30757877-20190928154234

As I said, he still retained his intelligence and was smart enough to lock himself until his Bat-Family could search for a cure. But he chose to embrace the effects of the Joker's toxin. Much like how Scar embraced the effects of the Strange Cobra's venom...