When antisemitism moves from the shameful fringe into the public square, it is not about Jews. It is never about Jews. It is about everyone else. It is about the surrounding society or the culture or the country. It is an early warning system—a sign that the society itself is breaking down. That it is dying. It is a symptom of a much deeper crisis—one that explains how, in the span of a little over 20 years since Sept 11, educated people now respond to an act of savagery not with a defense of civilization, but with a defense of barbarism.