This must stop. Two incidents of political violence, both targeting groups of Jewish people, are two incidents too many. Less than two weeks ago, a gunman shot and killed two Israeli embassy staffers in Washington DC, yelling “Free Palestine” as he was being detained. This week, a man used a “makeshift flamethrower” along with other incendiary devices to attack a Boulder, Colorado, rally organized by Run for Their Lives, a group which organizes events “calling for the immediate release of the hostages held by Hamas”. Eight people were injured in this latest assault, at least two of them seriously. These...