They say talk is cheap. But in fact it can be devastatingly expensive. Among the generation of Germans who were enthralled by Hitler's eloquence, millions paid with their lives and their children's lives for empowering this demagogue to lead them to ruin and infamy. Germany before Hitler was one of the more tolerant nations in Europe. That was what attracted so many Jewish immigrants from Eastern Europe — tragically, to their doom. German immigrants who settled around the world have been among the more tolerant peoples — not angels, a standard that only intellectuals could use, but comparing favorably with...