It’s a safe bet that those anti-Israel protestors on college campuses and in the streets of American cities see themselves as virtuous. They see their protests as righteous. They think they can do just about anything because their cause is just. So in Manhattan late last month they glued themselves to Sixth Avenue and blocked the Macy’s Thanksgiving Day Parade to show support for the people in Gaza. A few hours later they vandalized the facade of the New York Public Library’s main building, doing about $75,000 of damage, according to news reports. A few days after that, they burned...