-In mentioning these arguments in passing, I'm definitely _not_ trying to provide a comprehensive lit review on the question. (That's [someone else's blog](https://humanvarieties.org/2019/12/22/the-persistence-of-cognitive-inequality-reflections-on-arthur-jensens-not-unreasonable-hypothesis-after-fifty-years/).)
+In mentioning these arguments in passing, I'm _not_ trying to provide a comprehensive lit review on the causality of group IQ differences. (That's [someone else's blog](https://humanvarieties.org/2019/12/22/the-persistence-of-cognitive-inequality-reflections-on-arthur-jensens-not-unreasonable-hypothesis-after-fifty-years/).) I'm not (that) interested in this particular topic. I am ... doing some context-setting for the problem I am interested in, of fixing public discourse. The reason we can't have an intellectually-honest public discussion about human biodiversity is because good people want to respect the anti-oppression Schelling point and are afraid of giving ammunition to racists and sexists in the war over the shared map. "Black people are genetically less intelligent than white people, on average" is the kind of sentence that pretty much only racists would feel _good_ about saying out loud, independently of its actual truth value. In a world where most speech is about manipulating shared maps for political advantage rather than _getting the right answer for the right reasons_, it is _rational_ to infer that anyone who entertains such hypotheses is either motivated by racial malice, or is at least complicit with it—and that rational expectation isn't easily cancelled with a _pro forma_ "But free inquiry" or "But the true meaning of equality is unfalsifiable" disclaimer.
+
+To speak to those who aren't _already_ oblivious science nerds—or are committed to emulating such, as it is scientifically dubious whether anyone is really that oblivious—you need to put _more effort_ into your excuse for why you're interested in these topics. Here's mine, and it's from the heart, though it's up to the reader to judge for herself how credible I am when I say this—
+
+I don't want to be complicit with hatred or oppression. I want to stay loyal to the underlying egalitarian–individualist axiology that makes the blank slate doctrine _sound like a good idea_. But I also want to understand reality, to make sense of things. I want a world that's not lying to me. Having to believe false things—or even just not being able _say_ certain true things when they would otherwise be relevant—extracts a _dire_ cost on our ability to make sense of the world, because you can't just censor a few forbidden hypotheses—[you have to censor everything that _implies_ them](https://www.lesswrong.com/posts/wyyfFfaRar2jEdeQK/entangled-truths-contagious-lies), and everything that implies _them_: the more adept you are at making logical connections, [the more of your mind you need to excise to stay in compliance](https://www.lesswrong.com/posts/XTWkjCJScy2GFAgDt/dark-side-epistemology).
+
+We can't talk about group differences, for fear that belief in differences will be abused to shore up oppression. But ... structural oppression and actual group differences can _both exist at the same time_. They're not contradicting each other! The fact that men are physically stronger than women is _not unrelated_ to the persistence of patriarchy! That doesn't mean patriarchy is good! [(You can't derive an _ought_ from an _is_.)](https://plato.stanford.edu/entries/hume-moral/#io) This is pretty obvious, really?