When you think about the Holocaust, as we all do in a 21st century shaped by the cataclysms of the 20th, what images appear in your mind’s eye? I see Nazis marching into city squares. Jews crushed into airless cattle cars. An iron gate with the inscription “arbeit macht frei,” and beyond it, rows of spartan dormitories housing skeletal inmates in filthy striped uniforms, subjected to all manner of dehumanization.