It seems like every week there's a new horror story of political correctness run amok at some college campus. A warning not to wear culturally insensitive Halloween costumes sparked an imbroglio at Yale, which went viral over the weekend. A lecturer asked in an e-mail, "Is there no room anymore for a child to be a little bit obnoxious . . . a little bit inappropriate or provocative or, yes, offensive?" Students went ballistic. When an administrator (who is the lecturer's spouse) defended free speech, some students wanted his head. One student wrote in a Yale Herald op-ed (now taken down): "He doesn't get it. And I don't want to debate. I want to talk about my pain." Washington Post columnist (and Tufts professor) Daniel Drezner was initially horrified by the spectacle but ultimately backtracked. Invoking Friedrich Hayek's insights from "The Use of Knowledge in Society," Drezner cautions outside observers that "there is an awful lot of knowledge that is local in character, that cannot be culled from abstract principles or detached observers."