David Duke, the leader of American racists, had good reason to thank Trump this week. When the president of the United States says that the victim is just as responsible as the murderer, or that the counterdemonstrator is just as guilty as the Nazi waving the swastika flag and shouting, “Jews will not replace us,” and when Trump’s own party doesn’t drop him even now, then Duke and Trump have already achieved a key goal. Tolerance, empathy, kindness and diversity of opinion are all disparaged as political correctness. It becomes OK to say anything else, and if you can say it, it becomes easier to justify violence. The wheel of civilization has made a turn in reverse.