How they could’ve made this movie really work (Spoilers!):
All they had to do was reframe it so the confident Joker persona from the first movie gets beaten out of Fleck by the Asylum to destabilize his trial. And Fleck is constantly trying to hold onto it and escape into fantasy musicals that get distorted as the beatings and isolation get worse. The prosecution itself could exploit his traumatic past to illicit a regression, making Harvey Dent seem even more…