Twitter, reddit, facebook, hacker news aren't the public street. They are someone else's public meeting hall that you may rent out for the small price of contributing useful dialog and not being an asshole. The fact that they don't allow all comers is a feature not a bug because some would be patrons are hateful vandals whose presence is liable to discourage your more useful patrons from visiting.

The public street is the broader net where everyone can have a voice and decentralization is probably a more useful strategy. If you feel strongly that free speech on the internet is essential don't ask facebook to tolerate deplorables while others demand it kick them off.

When the deplorables kick puppies and blow up children you will certainly lose the argument.

Instead consider building or contributing to decentralized communications that are challenging to block under the ideal that a platform where its hard to block deplorables from communicating with one another is also free of interference for more savory communications.