They always seem to take the form of "Should we divide this group into A and B, A stays here and B goes over there and that way everybody is happy"
Invariably the person who proposes this wants to remain in group A and will not be a participant in group B.
To me this seems like the subtext is "Those people are not welcome here, they are not like us. It's not like we have anything against them, we just don't want them ramming it down our throats"
Anyone is free to make a website with whatever content they want, they can invite people to it and grow your own community. Directing a community to divide to remove an element you dislike is an attempt to appropriate the established community.