The massive coverup of Joe Biden’s mental decline has stimulated plenty of indignant commentary. Missing from the hand-wringing is a demand for accountability, which brings to mind the quip: “Everybody talks about the weather, but nobody does anything about it.” This newspaper and recently published books have exposed the trickery and lies of Mr. Biden’s minions and Democratic allies, who attempted to wield power in a leaderless vacuum. It was perfectly described in Tunku Varadarajan’s review of Jake Tapper and Alex Thompson’s book, “Original Sin,” as resembling “a hush-hush leftist capture of an infirm president.” A White House cadre, with...