The issue with the 'gender affirming care therapy is an immoral evil that needs to be eliminated' argument is pretty simple....it has worked like a motherfu$$a and there are no counter solutions that can generate close to the same outcomes.
Suicide rates are down significantly (73%) after starting gender affirming therapy.
https://www.hcplive.com/view/suicid...gender-nonbinary-youths-gender-affirming-care
On the flip side, suicide rates nearly double for those that have gone through 'conversion therapy'.
https://williamsinstitute.law.ucla.edu/press/lgb-suicide-ct-press-release/
The largest source for suicide is due to outside forces, not from an internal struggle (ie everyone calling them freaks with mental issues).
From the Trevor Project summary: 'LGBTQ youth are not inherently prone to suicide risk because of their sexual orientation or gender identity but rather placed at higher risk because of how they are mistreated and stigmatized in society'
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Now it's showing that regret rates for those who end up having surgical procedures are waaay less than the regret rates for those having standard procedures, including life saving procedures (just 1% have regrets out of 8000 examples compared to the average of 14%).
https://www.gendergp.com/new-study-...of-gender-affirming-surgery-are-non-existent/
So you have a very small group of people who are asking for gender affirming care that ultimately is saving lives....but, of course, there are a large group of people with absolutely no skin in the game (because if you did and it was your child that was a suicidal time bomb, I'm pretty sure you'd want the option to potentially save their lives) trying to tell others what is best, even if we know the solution doing nothing but denial raises the odds significantly that they'll die.
To me that's the crux of the argument. Until you can prove that gender affirming care doesn't provide potential life saving treatments, or you have a solution that generates even better results...the argument against is DOA.
Other notes to add.
The overwhelming majority of this gender affirming therapy program is counseling. As mentioned, the very few people that do something permanent before they are an adult have to get sign offs from a parent, doctor and mental health practitioner to even be considered.
Secondly, a study came out from things like census data that basically compared American responses to actuals when it comes to the size of groups.
For example, Americans believe that 21% of people are trans!!! Holy shit 1 out of 5 are trans!!! Nevermind the absurdity of that....but bigger picture obviously means that fear propaganda works.