+There is a _sense in which_ one might say that you "can" define a word any way you want. That is: words don't have intrinsic ontologically-basic meanings. We can imagine an alternative world where people spoke a language that was _like_ the English of our world, except that they use the word "tree" to refer to members of the empirical entity-cluster that we call "dogs" and _vice versa_, and it's hard to think of a meaningful sense in which one convention is "right" and the other is "wrong".
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+But there's also an important _sense in which_ we want to say that you "can't" define a word any way you want. That is: some ways of using words work better for transmitting information from one place to another. It would be harder to explain your observations from a trip to the local park in a language that used the word "tree" to refer to members of _either_ of the empirical entity-clusters that we call "dogs" and "trees", because grouping together things that aren't relevantly similar like that makes it harder to describe differences between the wagging-animal-trees and the leafy-plant-trees.
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+If you want to teach people about the philosophy of language, you want to convey _both_ of these lessons, against naïve essentialism, _and_ against naïve anti-essentialism. If the people who are widely recognized and trusted as the leaders of the systematically-correct-reasoning community _selectively_ teach _only_ the words-don't-have-intrinsic-ontologically-basic-meanings part when the topic at hand happens to be trans issues (because talking about the carve-reality-at-the-joints part would be [politically suicidal](https://www.lesswrong.com/posts/DoPo4PDjgSySquHX8/heads-i-win-tails-never-heard-of-her-or-selective-reporting)), then people who trust the leaders are likely to get the wrong idea about how the philosophy of language works—even if [the selective argumentation isn't _conscious_](https://www.lesswrong.com/posts/sXHQ9R5tahiaXEZhR/algorithmic-intent-a-hansonian-generalized-anti-zombie) and [even if every individual sentence they say is true](https://www.lesswrong.com/posts/MN4NRkMw7ggt9587K/firming-up-not-lying-around-its-edge-cases-is-less-broadly).
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+(As it is written of the fourth virtue of evenness, ["If you are selective about which arguments you inspect for flaws, or how hard you inspect for flaws, then every flaw you learn how to detect makes you that much stupider."](https://www.yudkowsky.net/rational/virtues))