You can tell the campus free-speech crisis is breaking into mainstream consciousness by the increasingly frantic efforts to deny it exists. Recent pieces by Matthew Yglesias, Jeffrey Sachs, and Andrew Hartman say the so-called campus free-speech crisis rests on a series of isolated shout-down anecdotes contradicted by opinion surveys showing broad student support for free speech. Besides, we’re told, today’s controversies aren’t much different than the ones that stirred public concern at the start of the campus “culture wars” three decades ago.