Last month, the commentariat was riveted by news from that expensive Vermont spa and indoctrination center, Middlebury College. On March 2, Charles Murray, one of America’s most distinguished social scientists, was to talk about his recent book Coming Apart, which is about social, economic, and other divisions in white America. When he was introduced before an audience of some four hundred, a patter of boos and catcalls disrupted the introduction. When he rose to speak, most of the audience stood up en masse and turned their backs on him. For the next twenty minutes, as Murray stood calmly at the podium, the mob cycled through a sequence of obviously rehearsed chants.

Eventually, college officials, acknowledging the futility of attempting to continue with Murray’s planned talk, announced that they would be moving the event to another location, ...