Well one, 500,000 dollars would pay for a lot of peoples' "psychological problems" so that much money is a joke. Suing over something like this is rediculous to begin with. The only thing that should happen over showing an inapropriate movie of any kind would be the termination of the teacher. The school board had nothing to do with the teacher's decision to show a movie like that anyway. They had no way of knowing so the only person responsible is the person.
In grade school, 5th grade, I watched Forest Gump in a class... lol. No one thought that was bad with all the gore, cussing, political stance, violence, drug use, sex, and nudity. So really, the guardians knew what the movie was about and knew that a lot of people would think it "disgusting" or "wrong" to show it.
Anyway, greed is terrible and if they want to bankrupt a school board that would mean the education of others would be damaged then that's them. I know I would feel terrible knowing that the money to buy books went into a new dollhouse for a child that probably wasn't even emotionally scarred in the first place.
Krista