Commentary Jan. 6, 2021, may have been a dark day for America, but it was merely symptomatic of something far worse. That day, a mob entered the Capitol Building, vandalized federal property, and terrified government workers and officials. Four people died. Many were injured. Condemnation was immediate and unanimous. No one defended the mob. That was the easy part—or at least it should have been. Mobs should be easy to condemn. All mobs. The commonalities among mobs far outweigh any differences. Whether the mob identifies with the left or the right, cites religious or economic motivation, or asserts specific or general grievances, it will quickly converge on a scapegoat. Societies willing to tolerate even a modicum of mob violence will eventually abandon the scapegoat to appease the mob, then collapse beneath the weight of a movement that can’t be appeased. In America today, all mobs that identify with the left …