My point is that when folks get angry, they get stupid, and stupidity knows no party or clique. Progressives should not meet this truism so defensively. I know we want to believe the best of our comrades. And I know that loudly congratulating one’s team for its superior intellect and virtue is a critical part of keeping a bubble of enthusiasm aloft and rising. So we adults can speak in whispers, if we must. But it’s a plain fact that the fuel-mixture of potent populism includes generous helpings of stupidity and self-regard.