It is a complex issue and perfectly OK to be on one side or the other - what's not OK is pretending that only one side is right and the other is evil and abandoning all nuance - that seems to be the trans activist way tho.
This is ironic of course, since you’ve ignored the nuance that the Keira Bell case was specifically regarding the ability of children under the age of 16 to consent to this treatment themselves. It does not question the lawfulness of the treatment or guidance itself, and it has been clearly established that parents or guardians can give consent. I have absolute sympathy with Keira Bell and the struggles she has gone through, but it seems clear we should want to avoid using the legal system to intervene in clinical decision making to the greatest extent possible.
For the record though, I disagree with you - I don’t think it’s a particularly complex issue. It has certainly been ratcheted into a hot-button culture-war topic by quite a lot of ignorance and deliberate muddying of the waters though, which can have the effect of making things seem more complex than they really are. You’ve just done this yourself—even if unintentionally—in your comment.
> It does not question the lawfulness of the treatment or guidance itself
Nobody is saying it does. The nuance is in fact what people are talking about. Many advocates for the trans community argue that under-16s should be able to choose such treatments for themselves without parental consent/oversight. The other side argues that trans issues should not be treated any differently than anything else, where generally children have limited say in medical interventions applied to them and that the responsibility is ultimately the parents'.
Almost no healthcare is harmless. Anyone can sue for almost anything, there's a low threshold to bring a case. Notably she didn't sue for a personal injury case because she knows she would have lost that - she was strongly advised by her doctor not to proceed, but she ignored that advice and went ahead anyway. She was over 16 at the time, and capacitous, and so she got the treatment that she asked for.