And Bernie Sanders posted an image of the POW/MIA flag on Facebook in response to Donald Trump’s insult against John McCain. The message read: “They are all heroes.”

Actually, as I document in The Invisible Bridge, it’s more complicated than that: many of the prisoners were anti-war activists. One member of the “Peace Committee” within the POW camps, Abel Larry Kavanaugh, was harassed into suicide after his return to the U.S. by the likes of Admiral James Stockdale, who tried to get Peace Committee members hanged for treason.

Stockdale would become one of the nation’s most celebrated former POWs and a vice-presidential candidate. Kavanaugh took his life in his father in law’s basement in Commerce City, Colorado, in June 1973. Americans would agree that one of them—Stockdale or Kavanaugh—is not a hero—though they would disagree about which one is which.

That damned flag: It’s a shroud. It smothers the complexity, the reality, of what really happened in Vietnam.