Victor Davis Hanson:
History is not static and it does not progress linearly. There was more free speech and unimpeded expression in 5th-century Athens than in Western Europe between 1934-45, or in Eastern Europe during 1946-1989. An American could speak his mind more freely in 1970 than now. Many in the United States had naively believed that the Enlightenment, the U.S. Constitution, and over two centuries of American customs and traditions had guaranteed that Americans could always take for granted free speech and unfettered inquiry.
That is an ahistorical assumption. The wish to silence, censor, and impede thought is just as strong a human emotion as the desire for free expression — especially when censorship is cloaked in rhetoric about fairness, equality, justice, and all the other euphemisms for not allowing the free promulgation of ideas.
George Orwell devoted his later years to warning us that while the fascist method of destroying free expression was easily identified (albeit only with difficulty combatted), the leftwing totalitarian impulse to squelch unpopular speech was far harder to resist — couched as it was in sloganeering about the “people” and “social justice.”