I discovered that most of the destructive changes to schools result from parents suing the school. Parents these days resent their child being put in a slow class, so now all students are mixed into one class. The teacher is expected to teach full spectrum. Parents resent their students getting a bad grade because they turn their work in late. Teachers are expected to accept work turned in anytime. Parents resent teachers swatting their kids, so corporal punishment is a criminal offense. This goes on and on.
Public schools are bad simply because parents pressured schools to "be gentle with my darling".