There have been instances that were defederated for posting nazi / racist content, and CSAM. Do you think that their users should be able to interact with everyone else, or that their content should be stored and hosted on other people's servers?
As far as I understand it, content posted to one server gets stored on every federated server for the other server's users to see. I certainly don't want to see the sort of content that's been defederated from the servers I mentioned.