I think there is one concern that cant be argued against: if a genetic basis were found, that opens the way to parents selecting against those genes in their unborn children. Like... imagine parents or the government deciding that theyd very much like to eradicate LGBT people before theyre born and having the capability to make it happen.

But transgender isn't an outcome, you're still not understanding. Transgender people are not fundamentally different from any other group of people. We just are transgender. Some of us don't even have dysphoria or seek out medical transition. The cause is entirely relativistic and unique to each transgender person.

Transgender isn't a property of a person it is a description of their relationship with the gender society assigned them.

It's not so much a mentality as it is objectively the truth though. Advocating for a genetically immutable cause for queerness does not do anything long term towards acceptance. We can see that in the modern wave of transphobia and homophobia. Arguing that we don't have a choice to be this way is also fundamentally different from "we don't have a choice because we have genetic abnormalities, or because we were abused as children". We are the way we are and we deserve respect and human dignity. We deserve autonomy and access to healthcare that improves our lives. People who disagree with those things are not going to be swayed by patently false "cause and effect" arguments. The medical science shows that giving us access to gender affirming medical care when we went it shows massive improvements in our well-being and in our long term health. The science surrounding our care is entirely detached from any kind of malformed research into a reason why we are this way.