Why do you assume these folks have no agency of their own? You seem to be going straight to the assumption that these views are being imposed on them by adults, rather than self-realized.
They are kids.... a lot of kids change their minds. Are you saying they should have to wait to undergo certain things?
I've avoided wading into this thread much in the last year or so, but I do follow along with the conversation. People like to throw things around flippantly like dax regarding genital mutilation. I'd like to see the statistics on just how often gender-reassignment surgery happens in minors. I presume it's vanishingly small, even in proportion to the already vanishingly small number of transgender kids participating in youth sports.
As for hormone therapy, I will note that on the one hand, anti-trans folks are saying, e.g., testosterone levels give trans girls an unfair advantage, yet on the other hand, we shouldn't let trans kids do hormone therapy. You put those two hands together, and the result is trans kids simply shouldn't be allowed to play youth sports. That seems unfair to me.
Now, the reality: with rare exceptions like abortions in some instances (i.e., with a court order that parental notification/consent would likely lead to abuse, in a jurisdiction that even allows such an exception), healthcare decisions for minors require not just the perceived need of the minor, but also the consent of a guardian (minors can't enter into contracts) and the medical judgment of a professional. So in the case of hormone therapy, if a minor talks to their parent/guardian about it, and they then discuss it with their family physician, and all parties agree that it is appropriate in whatever kind and degree, then that's just how healthcare is supposed to function for minors. I do not see that I have any right to insert myself into the equation, for moral, ethical, and privacy reasons.