There should be a Batman adaptation where the villains actually get better.

Like by the end of the series, Poison Ivy mostly just chills in the park and develops non-terrorist environmental solutions, Harley Quinn is a vigilante, the Riddler runs an extremely popular twitch channel, Alfred killed the Joker, Clayface went back to acting, Freeze cures his wife and stops doing crimes, and Harvey Dent opens a Daredevil-esque law firm.

Obviously the big issue with his no kill rule is that the bad guys just keep doing evil shit forever, so a series that actually shows people can improve when given the chance might actually make that stance a bit more palatable.