+That much was obvious to anyone who's had their Blanchardian enlightenment, and wouldn't have been worth the effort of writing a special private Document about. The disturbing hypothesis that occured to me in early 2020 was that, in the culture of the current year, affirmation of a cross-sex identity might happen to kids _who weren't even HSTS-taxon at all_.
+
+Very small children who are just learning what words mean say a lot of things that aren't true (I'm a grown-up; I'm a cat; I'm a dragon), and grownups tend to play along _in the moment_ as a fantasy game, but they don't _coordinate to make that the permanent new social reality_. Ten years ago, if an otherwise ordinary three-year-old boy had occasionally claimed to be a girl, I think his nice smart liberal unschooling grownups would treat it about the same way as when the kid claims to be a cat. (I'm going with the MtF case with only a little loss of generality; I don't think the egregore is quite as eager to "trans" females at this age.)
+
+But if the grown-ups have been trained to believe that "trans kids know who they are"—if they're emotionally eager at the prospect of having a transgender child, or fearful of the damage they might do by not affirming—they might selectively attend to confirming evidence that the child "is trans", selectively ignore evidence that the kid "is cis", and end up reinforcing a cross-sex identity that _would not have existed_ if not for their belief in it.
+
+Crucially, if innate gender identity _isn't_ a feature of toddler psychology, _the child has no way to know anything is "wrong."_ If none of the grown-ups can say, "You're a boy because boys are the ones with penises" (because that's not what people are supposed to believe in the current year), how is the child supposed to figure that out independently? [_Toddlers_ are not very sexually dimorphic](/2019/Jan/the-dialectic/), but sex differences in play styles tend to emerge within a few years. (Did you know the [sex difference in preference for toy cars is _d_ ≈ 2.44?!](/papers/davis-hines-how_large_are_gender_differences_in_toy_preferences.pdf)) What happens when the kid develops a self-identity as "a girl", only to find out, potentially years later, that she noticeably doesn't fit in with the (cis) girls on the [many occasions that no one has explicitly spelled out in advance](/2019/Dec/more-schelling/) where people are using "gender" (percieved sex) to make a prediction or decision?
+
+Some might protest, "But what's the harm? She can always change her mind later if she decides she's actually a boy." I don't doubt that if the child were to clearly and distinctly insist, "I'm definitely a boy," the nice smart liberal grown-ups would unhesitatingly accept that.
+
+But the harm I'm theorizing is _not_ that the child has an intrinsic male identity that hurts to not be respected. (What _is_ an "identity", apart from the ordinary factual belief that one is of a particular sex?) Rather, the concern is that social transition prompts everyone, _including the child themself_, to use their mental models of girls (juvenile female humans) to make (mostly subconscious rather than deliberative) predictions and decisions about the child, which will be a systematically worse statistical fit than their models of boys (juvenile male humans), because the child is, in fact, a boy (juvenile male human), and those miscalibrated predictions and decisions will make the child's life worse in a complicated, illegible way that doesn't necessarily result in the child spontaneously verbally asserting, "I prefer that you call me a boy."
+
+Scott Alexander has written about how [concept-shaped holes can be impossible to notice](https://slatestarcodex.com/2017/11/07/concept-shaped-holes-can-be-impossible-to-notice/). A culture whose [civic religion](https://slatestarcodex.com/2019/07/08/gay-rites-are-civil-rites/) celebrates being trans, and denies that gender has truth conditions other than the individual's say-so, has concept-shaped holes that make it hard to notice the hypothesis "I'm having a systematically worse childhood than I otherwise would have because all the grown-ups in my life have agreed I was a girl since I was three years old, even though all of my actual traits are sampled from the joint distribution of juvenile male humans, not juvenile female humans", even if it's true.
+
+... anyway, that's just a hypothesis that occured to me in early 2020, about something that _could_ happen in the culture of the current year, hypothetically, as far as I know. I'm not a parent and not a professional scientist. (And even if the "Clever Hans" etiological pathway I conjectured is real, the extent to which it might apply to any particular case is complex; you could imagine a kid who was "actually trans", whose social transition merely happened earlier than it otherwise would have due to these dynamics.)
+
+For some reason, it seemed really important that I draft a Document about it with lots of citations to send to a few friends. If I get around to it, I might clean it up and publish it as a blog post (working title: "Trans Kids on the Margin; and, Harms from Misleading Training Data").
+
+Given that I spent so many hours on this little research/writing project in early 2020, I think it makes sense for me to mention at this point in the memoir, where it fits in chronologically. I have an inalienable right to talk about my own research interests, and talking about my research interests obviously doesn't violate any norm against leaking private information about someone else's family, or criticizing someone's parenting decisions.
+
+(Only—you two have such beautiful children!)
+
+-----
+
+[TODO: "Human Diversity" review; all swans are white!]