Because some student demonstrations protesting his scheduled appearance have resulted in violence, the president of the Imperialist Society has been prevented from speaking about politics on campus by the dean of student affairs  Yet to deny anyone the unrestricted freedom to speak is to threaten everyone' s right to free expression
Hence, the dean' s decision has threatened everyone' s right to free expression
Dr. Pacheco saved a child's life by performing emergency surgery. But surgery rarely involves any risk to the surgeon. Ttherefore, if an act is not heroic unless it requires the actor to take some risk, Dr. Pacheco's surgery was not heroic.