When skepticism about the savagery of attacks by Hamas terrorists against Jews in Israel first surfaced, the Israel Defense Forces put together 45 minutes of gruesome imagery — most of it shot by the perpetrators — of murder, beheadings, rapes, and other atrocities against Jewish adults and children. Initially shown to world leaders, ambassadors and journalists covering the attack and the ensuing response by Israel military forces, that footage will be shown this week in screenings organized in Hollywood and New York. Several in Hollywood who are Jewish spoke with me to see if I’d been among those who were...