why is this related to the question of making community sites profitable? community-driven isn't the same as a non-divided society, lots of communities form around various division lines.
Removing the content you don't like comes in different shapes. Reducing diversity is bad in the context of people and culture, why is it different online? I know why, we need profit. Profit over people, profit over diversity. Anyways, as some of the guys pointed out, Reddit had some good years.