Susanne DeWitt, an 89-year-old Holocaust survivor who later became a molecular biologist, recently spoke before the Berkeley City Council to request a Holocaust Remembrance Day proclamation. After taking note of a “horrendous surge in antisemitism,” she was then heckled and shouted down by protesters at the meeting when she mentioned the massacre and rapes in Israel of Oct. 7. At the same meeting, a woman testified that her 7-year-old Jewish son heard “a group of kids at his school say, ‘Jews are stupid.’” She, too, was heckled: “Zionists are stupider,” a protester said. At the same meeting, others yelled, “cowards,...