Hi!!
There are a high percentage of individuals under the transgender umbrella that are L, G, or B. That is one reason to stay with them. The other is numbers: there simply are not enough of us to have much influence without support from the greater LGBT community.
I realize the not everyone will agree with all parts of the LGBT community. However, considering how often I change my own mind and my own agenda, I can't really ask anyone to believe/behave exactly the same as I.
Lastly, please be careful about over generalizing other communities.
Hugs,
Jen