WALL STREET JOURNAL: The Politicization Of Everything.

Healthy democracies have ample room for politics but leave a larger space for civil society and culture that unites more than divides. With the politicization of the National Football League and the national anthem, the Divided States of America are exhibiting a very unhealthy level of polarization and mistrust.

The progressive forces of identity politics started this poisoning of America’s favorite spectator sport last year by making a hero of Colin Kaepernick for refusing to stand for “The Star-Spangled Banner” before games. They raised the stakes this year by turning him into a progressive martyr because no team had picked him up to play quarterback after he opted out of his contract with the San Francisco 49ers.

The NFL is a meritocracy, and maybe coaches and general managers thought he wasn’t good enough for the divisions he might cause in a locker room or among fans. But the left said it was all about race and class.

All of this is cultural catnip for Donald Trump, who pounced on Friday night at a rally and on the weekend on Twitter with his familiar combination of gut political instinct, rhetorical excess, and ignorance. “Wouldn’t you love to see one of these NFL owners, when somebody disrespects our flag, to say, ‘Get that son of a bitch off the field right now, out, he’s fired. He’s fired,’” Mr. Trump said Friday.

No doubt most Americans agree with Mr. Trump that they don’t want their flag disrespected, especially by millionaire athletes. But Mr. Trump never stops at reasonable, and so he called for kneeling players to be fired or suspended, and if the league didn’t comply for fans to “boycott” the NFL.

Well, Trump’s got his opponents arguing against the National Anthem, so maybe he’s not as dumb as you think. But whenever you wonder why we’re in a situation where Trump’s driving this sort of narrative, remember that we got Trump because the respectable political class did such a sorry job that there was an opening for Trump.