edit: Adding a bit more, the people being bubbled away will likely tend to just isolate. You might think you like that idea, but having spent some time in isolation, I will attest that it kind of messes with your head. You lose your "phase lock" with society on a lot of different norms, small and large. The stereotype of the "dangerous loner", though not always fair, attests to this reality.
If you want to keep someone as a useful member of society and not a tragedy-of-the-day, you have to keep talking to them.
Remember trolls wreaking havoc on forums? Didn’t they have the right for free speech too and nobody complained when rules were added to try to contain them?
The only way to actually change someone is conversation.
Only those who don't want honest change fight to prevent actual conversation from happening.
And by freedom of speech and thought, how about for twitter? Arent’t they a private company?