The battle began last Wednesday morning when Columbia University students set up a tent encampment on the campus to protest the university’s financial ties to Israel and demand a cease-fire in Gaza. The university warned the students that the encampment violated university rules. When they refused to leave, the university called in the police, who arrested more than a hundred protesters. As of this writing, pro-Palestinian demonstrators both on and off campus have prompted Columbia to hold only remote classes. One reportedly told Jewish students to “go back to Poland,” and another held up a sign suggesting that Hamas attack...