I think that Mermaids etc are right (ha, never thought I would type those words) that LGBA have focused disproportionately on fighting the TRA narrative rather than supporting LGB people generally
But actually, there's a good reason for fighting the TRA narrative, because trans activism is now the biggest threat to lesbian and gay people.
I agree - the justification for LGBA having a large focus on combating gender ideology would be that it is currently a major threat to gay people, particularly lesbians and gay teens. Not the only threat of course, but a major one.