How widespread does the abuse have to be? One should be the limit. 

" Officials at the school, which is part of the Cherry Creek School District, maintain they didn’t know about the allegations from March 2016 when they made the controversial decision not to tell parents about the May 2017 arrest of the guard, Broderick Lundie, citing a belief that the alleged abuse was not widespread."

Private school is the way to go , folks.  Parents have more influence, as opposed to the ridiculously  politically correct government.