I don’t doubt for a second that some of the kids who are identifying as trans / non-binary etc are doing so because of other reasons
It's not "some", it's "all".
The (social media-fuelled) mental health crisis is massive and this (social media-fuelled) movement has come along to sweep up the vulnerable and tell them everything will be wonderful as long as they submit to major acts of bodily self-harm and large-scale games of pretend, otherwise things will be very bleak indeed and premature death is a guaranteed certainty.
The movement blows rainbow glitter off one hand, and dangles a noose with the other. It's been endorsed by Dr Who and Netflix and every other piece of popular media from the last 5 years, to make the message "you were born in the wrong body" seem both palatable and like it deserves to have a place anywhere in society. Those who endorse it trick themselves into thinking they're believing in an act of hip progressiveness when it's a movement packed with backwards sexist stereotypes, that a male in any circumstance should automatically be considered a woman.
It's a movement that even comes with its own set of society-endorsed baddies to boo and attack, the maternal-esque for the vulnerable to rebel against: women who care about old-fashioned nonsense like safeguarding and protecting the young, as well as their own rights that are also being wrecked in the process.
So for the BBC to endorse this regressivism yet again is to do a disservice to, well, basically everyone who can see what's going on.