Last week in Congress, Representative Elise Stefanik proved how well she can throw a dead cat. Let me explain. During an hours-long hearing on 5 December, members of Congress grilled university presidents from Harvard, MIT and the University of Pennsylvania, some of the country’s most elite institutions of higher learning, about antisemitism on their campuses. But it was Stefanik’s questioning that grabbed the spotlight. She repeatedly asked the presidents essentially the same question: does calling for the genocide of Jews on your campus constitute harassment, yes or no? The question is a trap, of course, and for several reasons. The...