In this country, many on the Left blithely toss off comparisons between President Donald Trump and Adolf Hitler. Their rad comrades in Germany also have a nominee for the top leadership position in the coming Fourth Reich: the Alternative for Germany party, or AfD. A Nazi replay is really not the goal of the right-wing AfD — which features a lesbian, former Goldman Sachs banker with an immigrant partner as its leader. But unlike in the United States, at least their critics have a direct acquaintance with those who have a political preference for a psychopathic dictator, Polish invasions, Auschwitz,...