@FermatsTheorem
It isn't about allowing the research, it's about getting the funding and finding regular and intelligent people who want to do the research as well as deciding if the research is worthwhile.
Does it matter if someone is gay because they were abused but they're in love and happy with a same sex partner? Would the research be used by American Christian camps to 'straighten the gays' and prove it's choice? I don't care if someone's gay or trans because they're born that way or if life experiences made them that way. If they're happy with their current situation then anything else is academic. Does it matter if a different race is more or less intelligent or more adept at a certain skill? I have a feeling that only racists are interested in trends like these. The rest of us are happy with treating individuals as individuals. These questions are only of scientific interest in very specific circumstances and the scientific community with it's Liberal bent have no interest in researching.
Datun made a trite point made by anti-homosexual protesters years ago. Let them into schools and they abuse. They'll use power and ensure it stays a secret etc. Teachers also mustn't disclose 'gay status' (using your term) and this can equally be abused. If a child tells us they're gay, we don't question them or out them. We support them. In theory we could use this knowledge to abuse them but it's nonsense to think that the 'trans agenda' are making schools dangerous.
There's a thread somewhere on MN (AIBU?) where someone wants a book explaining trans to children removed from the library. If so then it creates this potential issue you mention where the power of the secret can be leveraged.
@Pratchet
"[homosexuals] Not harmful to self or others"
Well. Whenever I accidentally read about pornification there are comments about girls all thinking bum stuff is normal and expected. If it's damaging to them, it's damaging to gay men.
I don't think that homosexuals damage others but not long ago they were seen as perverts who couldn't be trusted in changing rooms (ring any bells?)
"Is it possible to be born in the wrong body?"
That depends on how you define wrong. If you believe that gender is mostly innate and that men and women tend to have different brains (physically isn't up for debate, chemically isn't up for debate, the way they work isn't up for debate, the fact that these differences exist before birth isn't up for debate) then of course it is. If you're ideologically opposed to the notion of sex-based differences in the genders due to evolution then a) you shouldn't be a scientist b) you think it's impossible.
How is it harmful to behave as though gender can only be nurture?
In my reply, I've mentioned the parallels between homosexuality and trans people. I think there are massive correlations in homophobia from a few decades ago and transphobia at the moment and as always, those with arguments at the extreme are morons.