When we apply a Nazi comparison to someone or something that does not fit that comparison, then Nazism and the Holocaust lose their power to shock us. And they must never lose that power. If they do, which is quickly happening right now, when something diabolical does come along again in this world, we have no way to identify it, let alone stop it, because we've cried Nazi wolf so often that the comparison has lost its power to persuade. I fear this rhetorical desensitization has already happened in our delayed responses to atrocities in Syria, Rwanda, Darfur and beyond.