A large part of the problem, in m view, is that these LGBT groups often get kudos for their activities - and of course there's the Stonewall approval effect.
I'm trying not to out myself, so keeping this vague as possible, even though I'm now retired.
In the time that I was in middle management, I was perplexed at the changes from LGB positivity to the emphasis on gender identity and transitioning.
A school down the road from us got a great deal of publicity for their approved LGBT group because an exceptionally famous person visited and spoke to the kids. It even featured on national tv.
Our HT was challenged by a local councillor for not having the school displaying LGBT posters and flags around the school. He commented that a certain other school close by didn't display them either. "Yes, but it's different for them..."
The difference was that the other school was a Catholic school.
I think that the tide is turning now, but I have friends who were non-Catholic but sought places in Catholic schools because the emphasis there was still on education. I only have experience of having taught in a Catholic school once. Ditto, my late husband.
Our experience was that there was a push for all children to do their best academically. The one matter that did give me pause, I admit, is that both schools used Spike Milligan's "Unto Us" for English lit. Mind you, the non-denominational school that I attended in the 1970s used the same poem.