If your criteria are that a medical treatment is absolutely 100% safe and can be reversed as if absolutely no intervention was completed, then well, yeah, we shouldn't have Tylenol. Medicine is ALWAYS about balancing risks, and trying to make sure things are the least invasive option. It's done every day, in every Drs office.

Concern trolling about this particular case while spreading misinformation is in fact being "against" those particular people. Let them work out the safest option with their doctor in peace, like you would be able to do with your own health concerns. For all practical purposes, puberty blockers are relatively safe and reversible.