I'd go one further on the right to be exclusionary...if we cannot retain the right to be exclusionary, then anyone who disagrees with what our group does/represents can join it en masse, take over its leadership, and vote it out of existence.
This would be handing the keys to the kingdom over to whatever bunch of whomevers believing in who knows what to make sure that the world comes out all nice and tidy, according to their own narrow view of things.
Oh...wait...that's pretty much what's already going on, isn't it? Nevermind!