A majority of conservatives believe the First Amendment doesn't protect the protest speech of NFL players (of course it does).  It's wrong that the only thing those ignorant students would accept was obedience.  It's worse that the only thing the President and his supports would accept from players is obedience. Many, including Marc Thiessen in today's Perspective, are calling for government punishment of disobedience.
If this sounds reminiscent, in miniature, of scenes from China’s Cultural Revolution, that’s because it reflects a similar totalitarian mindset.

But Carroll must accept a large share of blame for the constitutional ignorance of today's youth.  He was a leading voice for judging schools and teachers solely by averaged standardized test scores.  This incentivized spending less instructional time on subjects not tested, like Civics.  Sadly, the young are far from alone in their ignorance, as those already in positions of authority repeatedly demonstrate.