It's not a perfect analogy, but I think it's very similar. Teachers have to interact with all students, not just the ones who have trouble, but the ones who have trouble occupy a greater portion of the attention of teachers. So teachers spend an inordinate amount of time dwelling on the matter of neglect and abuse. The saddest most depressing cases stay in the minds of teachers for a long time, while the normal well cared for students are soon forgotten.

It wasn't, actually. I made that comment before I read the complaint. The statutory basis of their complaint is that Facebook constitutes some specie of nuisance, hence my later comment that even if we took their factual assertions at face value the charge asserted should be void for vagueness.