+But it's not very interesting to people like rationalists—although apparently not all people who _self-identify_ as rationalists—who want to use concepts to _describe reality_.
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+It's important to stress that this should _not_ be taken to mean that transgender identity claims should necessarily be rejected! (Bad arguments can be made for true propositions just as easily as false ones.) As Alexander briefly alludes to later ("I could relate this [...] to the various heavily researched apparent biological correlates of transgender"), a _non_-question-begging argument for accepting trans people as their desired gender might look like this:
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+ * *Claim*: Trans people are born with a brain-restricted intersex condition such that their psychology is much more typical of the other physiological sex: the proverbial "woman trapped in a man's body" (respectively "man ... woman's") trope is basically accurate.
+ * *Claim*: The medical interventions undergone during transition—hormone replacement surgery, sex reassignment surgery, _&c._—are effective at inducing the phenotype of the other physiological sex: physically, transitioning _works_.
+ * *Claim*: Gender is mostly attributed on the basis of apparent secondary sex characteristics: in most situations, most people don't care about predicting the configuration of someone's genitalia at birth or whether they have a Y chromosome.
+ * *Conclusion*: Trans people can legitimately be said to belong to their stated gender, using the _same_ criteria people usually use to decide such things.
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+Notice that this is an _empirical_ argument for why successfully-socially-transitioned trans people fit into _existing_ concepts of (social) gender, not a redefinition of words by fiat in order to avoid hurting someone's feelings. To the extent that any of the claims _fail_ to be true of self-identified trans people or some subset thereof—to the extent that physical transition _isn't_ effective, to the extent that people _do_ have legitimate use-cases for biological-sex classifications that aren't "fooled" by hormones and surgery—then the conclusion is correspondingly weakened.
+
+Let's consider some of what is known about trans women. (For the remainder of this post, I'm going to focus on trans women, for reasons of personal interest. The task of analyzing the situation of trans men is left to the interested reader.)