So, when did you become the judge & jury who declares the sexuality of every member?
How do you know that all the people you are calling straight are not B people who are currently in opposite sex relationships or even those who have not yet come out of the closet?
Even if there are 'straight' people supporting LGB people, why is that a problem?
Who says they are the ones who are the voices of the LGBA?
Who says the rest of the membership doesn't agree with whoever speaks for them?
Why don't you insist on digging down into places like Stonewall, who come out with appalling rubbish regularly but are never questioned when they say they speak for T people, & who also insist they speak for LGB people even when LGB people object & say Stonewall doesn't speak for them?
I know plenty of LGB people, none of them believe Stonewall speaks for them, so why does Stonewall get to announce they are the voice of people who actively reject them?
Most T people appear to be straight.
They are attracted to the opposite sex.
What are they doing in a group who say they speak for those who are same sex attracted?