In the words of Martin Luther King Jr., "Hate is too great a burden to bear." Yet for thousands of keffiyeh-wearing "pro-Palestinian" demonstrators on college campuses, hostility is winning the day. "Go back to Poland!" protesters taunted Jews at my alma mater, Columbia University, where some were heard calling for "10,000" more Oct. 7 massacres. One protest leader even live-streamed a video in which he said, "Zionists don't deserve to live." Jewish students felt targeted even before a campus rabbi warned them to "return home as soon as possible," contending that the university couldn't guarantee their safety. Just yesterday, in...