America's liberal arts universities have long been safe zones for leftist thinking, protected ivory towers for the pseudo-elite who earn their livings writing papers nobody reads about gender roles in the poetry of Maya Angelou.

By giving professors jobs for life, universities create a feeling of unanswerable power among too many. Tenured professors who are uninterested in serving the student body are less likely to respond favorably to criticism, and are more likely to feel the freedom to intimidate or harass those with opposing viewpoints.

There is no greater way to ensure that universities remain a hotbed of leftist thought than to guarantee that professors knight their own successors. But that's basically how the Ph.D. system works, with sitting professors approving the work of would-be professors.

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