hmm

well there are all kinds of different communities and incentives to be a member of different communities...

online or irl

but generally

the deciding factor of why people end up in a particular community is because

*they want to be with the other people who are there.*

its entirely possible the great majority of people are busy with their own lives and the groups they are a part of

and aren't super interested in breaking free of their narrow perspectives.

maybe I'm wrong

just a thought.