By Dakin Andone, CNN (CNN) — With tension mounting over an encampment in support of Palestinians at New York’s Columbia University, police strode onto campus this month and arrested more than 100 demonstrators. Soon, dozens more students protesting the monthslong assault on Gaza were arrested at New York and Yale universities. At the University of Texas at Austin, police in riot gear and on horseback moved to disperse a like-minded demonstration, while nearly 100 at the University of Southern California also got arrested. Then at Emory University in Atlanta, law enforcement deployed pepper balls to break up a pro-Palestinian action,...