You know that racist flag? The one that supposedly honors history but actually spreads a pernicious myth? And is useful only to venal right-wing politicians who wish to exploit hatred by calling it heritage? It’s past time to pull it down.Oh, wait. You thought I was referring to the Confederate flag. Actually, I’m talking about the POW/MIA flag.I told the story in the first chapter of my 2014 book The Invisible Bridge: The Fall of Nixon and the Rise of Reagan: how Richard Nixon invented the cult of the “POW/MIA” in order to justify the carnage in Vietnam in a...