Turning Point USA founder and president Charlie Kirk threw hats at the crowd upon arriving last Wednesday to speak at an event at Utah Valley University, where he was shot and killed.

Trent Nelson/The Salt Lake Tribune/Getty Images News/Getty Images

The killing of political activist Charlie Kirk has thrown into sharp relief the hostility between conservatives and progressives and between champions of free speech and crusaders against hate propaganda. It also highlights a less obvious dichotomy: between a marketplace of commodified opinion, on the one hand, and seedbeds for deliberation and dialogue, on the other. The former dominates the political culture in open societies. The latter is what universities urgently need to cultivate.

The New York Times columnist Ezra Klein privileged t

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