Yossi Klein Halevi is a senior fellow of the Shalom Hartman Institute in Jerusalem and co-host of its podcast, For Heaven’s Sake. He is writing a book on the meaning of Jewish survival. Perhaps the most enduring wound for Jews from the Holocaust is the memory of aloneness. For 12 long years, the international community scarcely intervened as Nazi persecution gradually turned to extermination. Even as we established a sovereign state and created thriving communities in a free diaspora, there remained a lingering anxiety that the post-Holocaust era of Jewish acceptance, at least in the West, was an aberration, and...