I'm not going to jump on that, either. I think liability for being able to guess and predict behavior like that needs to be REALLY strictly limited. Hindsight is 20/20. Real time isn't.
The city and school district have deeper pockets than a janitor still living with his mom and dad. Although, I do think he had his own residence when this was occurring and now lives with his folks as part of his bail arrangement until trial. I am fuzzy on the details though, so not quite sure.
I do feel sorry for the girl, however I feel great contempt for her lawyer. Unless this guy was hiding a rap sheet from the district, the school really doesn't know what employees do at home until after they get into trouble.