"LGBT-ness" is not one thing. It is a political/cultural category that lumps together several demographic categories. I continue to think gay men, at least, are probably (mostly?) born that way.
The Center for the Study of Partisanship and Ideology did a detailed report on the LGBT increase. Quote:
"When we look at homosexual behavior, we find that it has grown much less rapidly than LGBT identification. Men and women under 30 who reported a sexual partner in the last five years dropped from around 96% exclusively heterosexual in the 1990s to 92% exclusively heterosexual in 2021. Whereas in 2008 attitudes and behavior were similar, by 2021 LGBT identification was running at twice the rate of LGBT sexual behavior.
[...] high-point estimate of an 11-point increase in LGBT identity between 2008 and 2021 among Americans under 30. Of that, around 4 points can be explained by an increase in same-sex behavior. The majority of the increase in LGBT identity can be traced to how those who only engage in heterosexual behavior describe themselves"
The assumption that a misaligned AI will choose to kill us may be false. It would be very cheap to keep us alive/keep copies of us and it may find running experiments on us marginally more valuable. See "More on the 'human experimentation' s-risk":
There is discussion of some possibilities at https://www.reddit.com/r/SufferingRisk/wiki/intro/. I'd like to see more talk about these issues.