NEWYou can now listen to Fox News articles! On October 10, 2023 — just three days after Hamas perpetrated the largest bloodletting of Jews since the Holocaust — I was preparing to teach my evening graduate seminar at Northeastern University on terrorism and counterterrorism, when a stranger accosted me in the hallway by my office. Wearing a keffiyeh, he pressed a flier into my hand to attend a "vigil" in Cambridge advocating Palestinian resistance.