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
In order to rescue a drowning child, Isabel jumped into a freezing river. Such acts of heroism performed to save the life of one enrich the lives of all. Hence, Isabel's action enriched the lives of all.