VICTOR DAVIS HANSON: The Glass House of the NFL.

Multimillionaire young players, mostly in their 20s, often cannot quite explain why they have become so furious at emblems of the country in which they are doing so well.

Their gripes at best seem episodic and are often without supporting data. Are they mad at supposedly inordinate police brutality toward black citizens, or racial disparity caused by bias, or the perceived vulgarity of President Donald Trump?

The result, fairly or not, is that a lot of viewers do not understand why so many young, rich players show such disrespect for their country — and, by extension, insult their far poorer fans, whose loyal support has helped pay their salaries.

ESPN talking heads and network TV analysts do not help. They often pose as social-justice warriors, but they are ill-equipped to offer sermons to fans on their ethical shortcomings that have nothing to do with football.

In truth, the NFL’s hard-core fan base is not composed of bicoastal hipsters. Rather, the league’s fan base is formed mostly by red-state Americans — and many of them are becoming increasingly turned off by the culture of professional football.

Indeed. When purveyors of popular entertainment take stands unpopular with their fans, the result is professional suicide.