Here we go again. For several years now we have watched as the cultural Left has argued that political correctness does not exist; or, if it does exist, that it’s not a threat to free speech; or, if it might sometimes possibly be a threat to free speech, that policing virtue is more important than protecting free speech; or—but you get the point. One particularly clever champion of this species of cultural warfare has even declared that there is no such thing as free speech, that it would be a terrible thing if there were, and hence that “right-wing” critics of political correctness are not only wrong but also insidious. Q.E.D.

Unfortunately, reality keeps breaking in. The latest fissure comes to us from that venerable bastion of orthodoxy, the Harvard Law School. In a recent Wall Street Journal Op-Ed piece called “Harvard Law Caves In to the Censors,” Harvey A. Silverglate, ...

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