What is there to say about an anniversary like today’s International Holocaust Remembrance Day, falling on the date when the Red Army entered a camp in occupied Poland that the fleeing Germans called Auschwitz? That the Nazis were villains? That a million Jews were murdered there and millions more were murdered elsewhere across Europe by the Germans? That we can never forget? But we risk forgetting when Vladimir Putin’s propaganda claims that the Ukrainians defending their freedom are Nazis (even though the popularly elected Ukrainian president, Volodymyr Zelenskyy, is a Jew). Putin is trying to stir old memories of antisemitic...