One argument against “viewpoint diversity” on campus — that is, a campus that looks like America in terms of diverse moral and religious opinion — is that it’s anti-scientific.We should only humor opinions supported by scientific studies and on the right side of history. But actually, according to evolutionary psychology, we live in a time that privileges individual autonomy over what’s require to achieve human happiness by contributing to the perpetuation of a flourishing species. Studies show that our liberal and conservative views both reflect part of the truth about human nature, while slighting another part. And we should, if anything, privilege the opinions thought to be outmoded by our sophisticated cosmopolitans. That’s because undeniable technological and political progress is often achieved at a relational cost. I explain here. But briefly: In our time of popularized Cartesianism, student should read Plato and Shakespeare. Otherwise, they’ll never even read Descartes. Here I’m indebted to the great Jonathan Haidt, the genuinely heterodox evolutionary psychologist.