Davidai said that the university told him they banned him from campus because they could not ensure his safety. This followed a Columbia rabbi telling Jewish students to leave campus for their own safety.

The most basic obligation of a university is to ensure the safety of its faculty and students from physical assaults. If there is a problem on campus, it is found in those students or faculty who would threaten a Jewish professor if he were to walk on campus.

This is not part of the debate over what language is considered a threat or hateful rhetoric. This is barring a professor because his status alone makes his presence inflammatory or dangerous. I cannot imagine how the solution was barring the potential victim of religious-based bigotry and violence.