That is the side effect of using someone's platform that does not belong to you. If you are passionate about a topic and wish to ensure that people can discuss

That is the side effect of using someone's platform that does not belong to you. If you are passionate about a topic and wish to ensure that people can discuss it without forced redaction then register a domain, set up a forum and chat server and invite people to discuss. This of course isn't foolproof as you may find your hosting provider gets pressured to remove you so use a CDN and hide your origin servers. Be ready to change CDN's at a moments notice. If your platform is small then you should be able to keep it going for some time. If you become too popular then may be exposed to the same pressure that sites like Ars are facing. Assume ahead of time that search engines will also put your audience into a bubble or echo chamber so don't rely on search engines.