1. I think the social construct meme originated with radical feminism in the 1980s. It's easy to see why they would have promoted this idea. I suspect the transgender community swallowed it because they mistakenly thought it freed them from the sex-gender connection. Ironically, however, it actually delegitimizes them; for, if gender isn't objectively real, then being transgender isn't objectively real and you're left with mental illness as the only explanation for their condition.
2. In a free society, it is hard to justify withholding medical treatment from adults; the real question is with minors. (I prefer "minors" to "children," because the latter calls to mind medical experiments on five-year-olds, whereas transgender medical treatment isn't offered before puberty.) Some people say that minors shouldn't receive hormone therapy because it's "experimental"; but many treatments are experimental until they're not. As always in these cases, whether such treatment should be administered is based on a cost-benefit analysis; and, in the case of a minor, it is rightly performed by the minor's parents, who are best-positioned to exercise both prudence and compassion while seeking the best interests of their child.
3. I am not a researcher myself; but I have read that the percentage of transitioners who de-transition is quite small, and that many of those de-transition for reasons of social pressure rather than because they are no longer confident of who they are. I do, however, think it possible that many adolescents have been misled by the popular culture and have transitioned for the wrong reasons; but banning transitioning for all minors because some have been misled is like ... well, banning private possession of firearms, because some people use them to commit crimes.
4. The problem of women's spaces is one that I think will only be solved with time. Attitudes will have to change, and that takes time. There was a time when many White people were afraid to share bathrooms and water fountains with Black people, thinking they could catch diseases that way. Silly, right? Yet that fear persisted for a number of years. While we're waiting for attitudes to change, I think society must treat gender divergence as though it were a physical handicap: build ramps where we can, install special stalls where we can; but don't turn society upside down in the process.
5. True.
I have to confess an involuntary recoil at the use of the word "equitable." I think that word has been effectively poisoned by politics and is no longer useful for purposes of dialogue. Perhaps "fair" or "just"?
