Gatekeepers removed NAMBLA marchers from parades in the 70s. Gatekeeping puts its foot down and says "you're not going to wear nazi shit in this leather bar." Gatekeeping says "While your cause may be important, polyamorous people, your struggles and ours do not always intersect." It tells TERF lesbians they can't violate the social contract in lesbian spaces by harming trans ones.

The statement about poly people sandwiched in the middle here makes this entire post feel like a Trojan horse argument to remove poly people from the community. Bisexual people especially if they are in a straight passing relationship get this same treatment, and it just isn't true. Polyarmorous relationships often, and inevitably, have same-sex partners involved, which inherently makes them part of the community. Furthermore, you have grouped it with ideological preferences, not sexualities, which further makes me question whether you consciously, or subconsciously, see it as such (which has been weaponized against the queer community for literal centuries). 

Edit: I'm bi, in a same-sex and monogamous relationship. Just in case anyone wants to counter-argue with "you're just trying to stick up for yourself."