Nobody said it had to be a "Care Bears" film. (Jesus, strawman much?)
We were talking about the artless and unnecessary propagation of socially harmful and narratively boring stereotypes.
Your argument might have some juice outside Gotham, btw, a place where several notable villains are judged insane and sentenced to Arkham but have mentally healthy backstories. Eg: The Joker, Two Face, Poison Ivy, etc.