-And that's where the blank slate doctrine absolutely _shines_—it's the [Schelling point](/2019/Oct/self-identity-is-a-schelling-point/) for preventing group conflicts! If you admit that there could differences between groups, you open up the questions of in what exact traits and of what exact magnitude, which people have an incentive to lie about to divert resources and power to their group by establishing [unfair conventions](/2020/Jan/book-review-the-origins-of-unfairness/) and misrepresenting those contingent bargaining equilibria as the inevitable natural order.
+And that's where the blank slate doctrine absolutely _shines_—it's the [Schelling point](/2019/Oct/self-identity-is-a-schelling-point/) for preventing group conflicts! If you admit that there could differences between groups, you open up the questions of in what exact traits and of what exact magnitude, which people have an incentive to lie about to divert resources and power to their group by [establishing unfair conventions and then misrepresenting those contingent bargaining equilibria](/2020/Jan/book-review-the-origins-of-unfairness/) as some "inevitable" natural order.
+
+If you're afraid of purported answers being used as a pretext for oppression, you might hope to _make the question un-askable_. Can't oppress people on the basis of race if race _doesn't exist_! Denying the existence of sex is harder—which doesn't stop people from occasionally trying. But the taboo mostly only applies to _psychological_ trait differences, because those are more [politically sensitive](http://benjaminrosshoffman.com/judgment-punishment-and-the-information-suppression-field/)—and easier to motivatedly _see what you want to see_: whereas things like height or skin tone can be directly seen and uncontroversially measured with well-understood physical instruments (like a meterstick or digital photo pixel values), psychological assessments are _much_ more complicated and therefore hard to detach from the eye of the beholder. (If I describe Mary as "warm, compassionate, and agreeable", the words mean _something_ in the sense that they change what experiences you anticipate—if you believed my report, you would be _surprised_ if Mary were to kick your dog and make fun of your nose job—but the things that they mean are a high-level statistical signal in behavior for which we [don't have a simple measurement device](https://www.lesswrong.com/posts/edEXi4SpkXfvaX42j/schelling-categories-and-simple-membership-tests) like a meterstick to appeal to if you and I don't trust each other's character assessments of Mary.)
+
+Notice how the "not allowing sex and race differences in psychological traits to appear on shared maps is the 'sticky' Schelling point for resistance to sex- and race-based oppression" actually gives us an _explanation_ for _why_ one might justifiably have a sense that there are dread doors that we must not open. The orthodoxy isn't just being dumb for no reason.
+
+Murray opens the parts of the book about sex and race with acknowledgements of the injustice of historical patriarchy ("When the first wave of feminism in the United States got its start [...] women were rebelling not against mere inequality, but against near-total leagl subservience to men") and racial oppression ("slavery experienced by Africans in the New World went far beyond legal constraints [...] The freedom granted by emancipation in America was only marginally better in practice and the situation improved only slowly through the first half of the twentieth century"). It feels ... coerced. It probably _is_ coerced. (To his credit, Murray is generally pretty forthcoming about how the need to write "defensively" shaped the book, as in a sidebar in the introduction that says that he's prefer to say a lot more about evopsych, but he chose to just focus on empirical findings in order to avoid the charge of telling "just-so stories.")