The K-12 implosion is a big issue for our country. @instapundit (aka Glenn Reynolds) K-12 Implosion has been very prescient.
https://twitter.com/instapundit/status/556594367582842880
Perhaps the upper and middle classes have identified teaching/values being put forward in public schools which the parents know will not help their children, i.e. political correctness and its tenticles.