The abnormal is only a problem when it is harmful. When it is not harmful then you have to make a religious issue out of it to make it a problem.
But it is potentially harmful. If someone is prescribed a drug or a surgery, particularly at an age where there's such little regard for thinking about the long term impacts of something, and they mess up their internal organs or do something that can't be un-done because they're not thinking clearly...that's harm is it not?
I'm not religious so I'm not coming to it from a religious angle here.
There are externalities and potential negative effects anytime you're talking about drugs/surgery, and any time you're suggesting that the rest of society has to make accommodations and wear blinders, else "bigot".
I voice a lot of the same objections to the Ozempic craze we're seeing right now (and even more so when stories started getting published about people receiving Ozempic as young as 12-14).
If a doctor was prescribing that to people too loosely, and without enough consideration for long term effects, we'd call that irresponsible, the same way we would if an orthopedist was recommending back surgery to a disproportionately high number of people.
It should be noted that we (both as a society...and in terms of the eggshells the medical community walks on) are very different than how we'd approach anything else where an adolescent or even young adult was "sure of something".
There's a reason doctors won't typically do vasectomies on younger men who aren't married and don't have any kids yet. (I had to go to 3 different ones before I could get mine and I was over 30). The reason for that is understandable. You ask any 18-22 year old college guy, the prospect of "I'll never want kids, I love partying, and this means I'll be able to do it as much as I want and not have to worry about getting anyone pregnant" sounds awesome to a lot of people that age. And that thing that they're absolutely sure about at 19, could very well be a source of regret 10-15 years later.
I understand there is a lot of religious objections to it for reasons of "sexual immorality", but those haven't been my arguments.
Take alcohol for instance, most of use have positions that have just as much overlap with prohibitionist side than to the libertarian side all things considered. Because there's a degree of overlap doesn't mean any argument in favor of common sense alcohol restriction is coming from a "temperance movement" ideology.