1. If a Jewish student is not allowed onto the university premises, then his property rights are violated. According to the libertarian rule, no one has the right to encroach on someone else's property. If I have paid for an academic year at a university, I have the right to receive an education at this university for a year. If I am not allowed onto the university premises, then I am not being allowed to receive the educational service I have paid for. Islamists have the right to protest on their own property, but not on someone else's. University property is not the property of Islamists. 2. By property we mean not only property, but also the physical body of a person. Including the body of a Jewish student. Encroachment on someone else's property is unacceptable. There are several ways to encroach on someone else's property: by causing harm directly, by aiding the direct perpetrator, by inciting the direct perpetrator, and by other means known to criminal law. Supporting Hamas means supporting terrorism and the violation of someone else's property by inciting and aiding violence.