The lack of good surgery options does not mean they don't help. If anything the fact that regret rates for transition is well below the regret rates for other cosmetic surgery should be a strong indication that if you actually care about patient wellbeing, it's the other kinds of cosmetic surgery you ought to be focusing on.
What analogy do you see to the satanic cult thing? Children were told they had been abused, and many caregivers were being sentenced. Who is being told what in the trans hype? Children are falsely being told they are not trans? Then they falsely believe they are not trans and accuse their doctors? Or how does the analogy work?
1% regret: https://pubmed.ncbi.nlm.nih.gov/33968550/
Meanwhile, finding actual studies of regret of cosmetic surgery is much harder, because nobody cares or want to stop people from getting boob jobs unless they're trans. So we're stuck with poor quality surveys like this one [1] claiming 65% regret, this one done for a group with a profit motive [2] claiming 65% regret.
For reconstruction after breast cancer, it's not "so bad", with this actual study [3] finding "only" ca 20% moderate to strong regret for even reconstruction, and another ~28% expressing mild regret.
Even for non-cosmetic surgery, such as e.g. hip replacements etc., it's hard to find regret rates as low as for sex reassignment.
Should we ban all of these other treatments too?
[1] https://www.dailymail.co.uk/femail/article-2640543/Two-third...
[2] https://www.medicalaccidentgroup.co.uk/news/do-you-regret-ha....
[3] https://www.researchgate.net/publication/233371110_Regret_as...
The second claims to have looked into several studies, which might include ones like the first one. Would be nice to have an actually useful direct study, especially for young people.
As for cosmetic surgery, you brought that up. I don't think it is as worrying, as many of them are reversible, and they don't sterilize the recipients. Somebody regretting to get a nose job is hardly in the same category as someone regretting they cut off their penis.