The Electoral College formally affirmed Joe Biden’s victory Monday, but President Trump fights on, much like the Black Knight in “Monty Python and the Holy Grail” who won’t give up, even when his arms and legs have been chopped off.“ ’Tis but a scratch,” he says after King Arthur severs his right arm.“It’s just a flesh wound,” he insists as he loses the other arm.“I’m invincible!” he yells after losing his left leg, to which Arthur replies: “You’re a loony.”The psychology of the nation, six weeks since the election, is encapsulated in that 1975 movie scene.On Trump’s side, in his...