Communities are curation mechanisms they WILL centralize, a Bible group will ban blasphemous content. Also nostr by nature is censorship resistant so anybody could still share their views outside the group. I don't think we should be focussed on censorship in cases of communities because communities are by nature exclusive to some degree  

 Yeah, I would hope they share their views within the group because nobody can really be banned from the group, but those that want to only pay attention to a subset of users of the group have a way of doing that although I think that’s to their own detriment.