Mermaids say "but surely it’s a good thing to allow young people to explore their identities?"
Indeed - I was a teenager in the 70s, it was mostly all we did and it never involved irrevocably changing your body and rendering it infertile and incapable of orgasm.
Teenagers in the 80s had Boy George, Marilyn and Annie Lennox, for example, to make it very clear that you could look however you liked. Nobody suggested it might be a good thing to try and change your body permanently to be a facsimile of the opposite sex.
Being gay has never been easy, but in the 80s we began to understand that sexuality wasn't a thing you 'opted into' and gradually, more and more lesbians and gay men were able to come out to family, friends and the workplace. Clubs and pubs where lesbians and gay men could relax became more common.
Now? Lesbians in particular are being driven back 'underground' and their spaces are either being colonised by males claiming they're lesbians or closed completely because they're not allowed' to keep males out.
Mermaids have no clue how this movement they've embedded themselves into is doing the opposite of letting children and young people "explore" identities - it's forcing them to pick one.