Nobody is saying to shut down any instance, only that we, and others on the platform who think likewise, would like to not have to see those instances. Nobody is saying to shut down Truth Social or Pawoo or Baraag, for instance, despite having severe disagreements with those instances - we just decided, on our instances, not to federated with them. You aren't obligated to agree with us - you can make your own instance with your own rules, as others have said, or switch to an instance accommodating to your beliefs. But at the same time, it doesn't mean the rest of us have to listen. Think of defederation like blocking - I'm sure you have some sort of block list for trolls, spammers and bots. Same thing, but for an instance.