Remember Obama’s fist bump, the tap—the bump—he’d give his followers? Remember how absurd and fake—and staged—the gesture was? Compare that to this: President Trump punching the air after being shot and shouting, “Fight, fight, fight.” No other image is as stark. No other comparison is as clear. No other contrast is as sharp. No other words are necessary either, because we have before us a real profile of courage. We have a spontaneous and remarkable act of presidential courage. We have President Trump standing taller and stronger than those who guard him; than all who failed to protect him; than...