"Your comment is making the assumption that the environmental factor that causes homosexuality is witnessing other members of the species be homosexual, which is a large leap of logic to make."
I think research has found that people are more likely to engage in a behavior if they see others doing the same. For example, someone who would not ordinarily shoplift may do so during a riot where many people are looting stores. A 2019 survey found that "U.S. adults estimate that 23.6% of Americans are gay or lesbian", while Gallup estimates the fraction to be 4.5%. Link: https://news.gallup.com/poll/259571/americans-greatly-overes... . I think this overestimation may influence some behavior at the margin.
I'd be interested in hearing the voices of those downvoting this. Is one of the claims in the comment false, or do you disagree with the conclusion "I think this overestimation may influence some behavior at the margin." [note1] (or both)?
Additionally, what if the conclusion is right (hypothetically)? Is it really that improbable? And if the greater acceptance of homosexuality as of recently (compared to, say, the 19th century) does cause some otherwise-straight people to be gay, what exactly is the problem with that? Would that be something we should address?
And more generally, if we did find an environmental factor that was linked to homosexuality, would we want to address that factor?
Note 1: User Bostonian uses the term "at the margin" in their comment, and I don't know what they meant by that. I'm taking it to be the subset of people who are unsure of their sexuality, though perhaps the author was referring to something else.
I think research has found that people are more likely to engage in a behavior if they see others doing the same. For example, someone who would not ordinarily shoplift may do so during a riot where many people are looting stores. A 2019 survey found that "U.S. adults estimate that 23.6% of Americans are gay or lesbian", while Gallup estimates the fraction to be 4.5%. Link: https://news.gallup.com/poll/259571/americans-greatly-overes... . I think this overestimation may influence some behavior at the margin.