In ways that immediately brought to mind dangerous parallels with the yellow Star of David patch worn by Jews during the Third Reich, Donald Trump in November suggested that Syrian refugees, posing as allegedly dangerous Fifth Columnists, should wear badges on account of their Muslim faith so that they could not infiltrate American society and carry out plots against the nation. When asked by a reporter whether he thought the comparison with Nazi Germany was a fair one, Trump responded "you tell me." So shocking have been these and similar statements that not just liberal voices and outlets, but even...