Curious but friendly onlookers in the multicultural middle-class neighborhood in Amsterdam joined us. A café owner slowly crossed the street. “What’s happening?” she asked. “We are placing memorial stones in front of my grandparents’ home where they last lived before being deported in 1942,” I replied. “Please join us!”

The history of antisemitism is strewn with the corpses of Jews who could not get out of the way when words turned to violence. The slaying of innocent Jewish lives by Pittsburgh gunman Robert Bowers, who this weekend turned his rhetoric about killing Jews into the actual killing of Jewish people, is the latest example. We need laws to allow intervention much earlier, or this will not be the last time we see Jewish people die in America because they are Jews.