Except for the flickering police vans idling around Columbia University on a recent evening, the campus was almost the picture of an Ivy League idyll, with students striding past classical architecture in their autumnal best, clasping coffee cups. Yet the conspicuously beefed-up security presence was one sign that all is not well at Columbia. Since the Israel-Hamas war began last month, fierce debates about the conflict and the US’s response have riven the university, with students clashing in dueling statements, rallies, and occasional physical confrontations. Hundreds of faculty members have also gotten involved. The situation is acrimonious and shows no...