I understand the idea that a diverse selection of exclusive communities leads to isolationism and echo-chambers. I just don't know how to judge if it's true or not.
As others observe, those exclusive communities were the precursors of our inclusive communities. They gave the marginalized a safe space to learn acceptance, confidence, and toughness, and take that out of their safe space. And no one is a member of just one community, isolated from the rest, even when we try to be. The issue seems to me to be less about how exclusive of opinion those communities are, and more about how freely one may join and leave them while staying within bounds.
As others observe, those exclusive communities were the precursors of our inclusive communities. They gave the marginalized a safe space to learn acceptance, confidence, and toughness, and take that out of their safe space. And no one is a member of just one community, isolated from the rest, even when we try to be. The issue seems to me to be less about how exclusive of opinion those communities are, and more about how freely one may join and leave them while staying within bounds.