I live in France, where, as you are probably aware, many universities have been physically blockaded by students protesting government policy. This prevents others from attending classes and lecturers from teaching, regardless of whether or not they agree with the protestors. Now, it strikes me that these same protestors would complain vehemently and denounce the violation of their own rights and freedoms if the police were to block a road to prevent them from marching down it. Would that be hypocritical of them? Would it not constitute claiming a right for themselves which they have denied to others?