Archer Shurtliff and Jordan April, both 17, felt “weird” when in February they received an assignment asking students to argue for the extermination of Jewish people. The words “TOP SECRET” were stamped across the top in red. The “memorandum,” first posted online and addressed to senior Nazi party members, asked students to put themselves in the shoes of Adolf Hitler’s top aides. Archer and Jordan, who are not Jewish, wondered if they understood the assignment correctly. Did their teacher, Michael DeNobile, really mean for his students to argue in favor of the “Final Solution,” the Nazis’ justification for genocide? During...