Administrators need to be very careful about who they degenerate because being too trigger happy could be disastrous as you said.

Since people like to use the geographic analogy of countries/cities, communities should be gathering areas like a town hall where people discuss similar topics but instances would be like a city/country/state or whatever.

You don't never speak to your neighbor again just because he's a leftist or a capitalist. You never speak to them again if he and his family all start throwing their dog's poop at your windows. We're forgetting how to converse with people and it's a big problem online and in real life.

We should absolutely be defederating instances dedicated to child porn and other illegal activities, and if there's an instance that's responsible for brigading or attacks then sure. But opposing viewpoints should not be a valid reason to defederate, IMO. If we go down that slope of not being able to tolerate someone else's different views then we are doomed.