Bad parents will fuck up their children in all kinds of ways. In what way do you propose that preventing others from accessing the healthcare they seek when fully informed will lessen the potential harms to those other unfortunate kids?
Medical treatment is about doing more good than harm in the long run. It's never perfect. Having said that, long before any sort of pharmacological intervention, the standard is for the child to receive mental health care throughout (IIRC) and this should help filter out kids who have been "gaslit" by their parents, and in the absence of any data whatsoever, I'd say their number is extremely low.
Regardless of the number, where those standards aren't being met, that's clearly an issue with process rather than gender affirming care itself and doesn't invalidate it. Good things can be implemented poorly; I have no problem agreeing with that.
On the other hand, you have presented zero evidence that the children themselves who have received what I would call proper treatment (as defined above) are worse off for it.
I hope you will re-examine your logic on this issue, but in the end you seem to have made up your mind so take it FWIW. I'm pretty much done here. Again, I beg your pardon for jumping in in the first place.