Wasn’t free self-expression the whole point of social progressivism? Wasn’t liberal academe a way for ideas, good and bad, to be subjected to enlightened reason? Generations of professors and students imagined the university to be a temple for productive challenge and perpetually questioned certainties. Now, some feared, schools were being reimagined as safe spaces for coddled youths and the self-defined, untested truths that they held dear. Disorientingly, too, none of the disputes followed normal ideological divides: both the activists and their opponents were multicultural, educated, and true of heart. At some point, it seemed, the American left on campus stopped being able to hear itself think.