As I watched the presidents of Harvard University, Massachusetts Institute of Technology and the University of Pennsylvania struggle last week to respond to harsh congressional questioning about the prevalence of antisemitism on their campuses, I had a singular thought: Censorship helped put these presidents in their predicament, and censorship will not help them escape. To understand what I mean, we have to understand what, exactly, was wrong — and right — with their responses in the now-viral exchange with Rep. Elise Stefanik, R-N.Y. The key moment occurred when Stefanik asked whether “calling for the genocide of Jews” would violate school...