NEW YORK (AP) — The references seem endless, and they can come from anywhere. In recent days, Pope Francis compared Nicaragua’s repression of Catholics to Hitler’s rule in Germany. In Britain, a BBC sportscaster likened the nation’s asylum policy to 1930s Germany, resulting in his brief suspension and a national uproar. For Holocaust and anti-Nazi scholars and organizations, the two sentiments were understandable — but concerning. Invoking Hitler and Nazi Germany, they warn, often serves to revive a familiar and unwelcome line of argument. “We have to be aware of, and confront, contemporary instances of discrimination, hate speech and human...