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You can talk in hand-wavey sound bites about civil liberties that's not the world we've chosen to create, and it's hard to understand how you can earnestly compare racism and homosexuality. Are violent racists oppressed when they're not permitted to deny the rights of minorities, in the same way minorities are oppressed when they're not permitted to exercise their rights? Perhaps when you're philosophising in comments on the internet about civil liberties they're the same but in the real world they are not.

You cannot effectively allow people to individually "filter out" toxic behaviour within a community because toxic behaviour permeates all aspects of participation in a community. The views we hold are fundamental to all aspects of our lives: our lives are built upon our views. A violent anti-semite's beliefs are present in their views on politics, religion, video games, food, housing, travel, science, technology... you cannot effectively "filter out" the fundamentals of someone's view points without neutering their speech -- which is no different from de-platforming them.

A community is a group of people and a group of people is a collection of beliefs, a community is not a bunch of people who use the same website but are intentionally siloed because their beliefs are incompatible. People who favour the PlayStation 4 over the Xbox One can be part of a community with people who favour the Xbox One over the Playstation 4, but can people who wish death upon all jews be a part of a community with jewish people?

That is, unfortunately, unworkable. You cannot successful quarantine toxic people from non-toxic people in the same community. People who aren't toxic rarely want to spend their time around toxic people, and those that don't mind it are usually those who aren't the targets of the toxic people. A community with many members who are openly white supremacists might not be uncomfortable for other white people -- even if they themselves are not white supremacists -- but it's almost certainly unusable for those that are the target of the white supremacists ire. Look at any "open communication platform" that doesn't make any effort to ban "toxic" behaviour and you'll find that the toxic behaviour leaks into every aspect of the platform.

If a website permits members to be openly anti-semitic or racist or sexist then they will be anti-semitic, racist and sexist everywhere, whether that's a quarantined sub-community about anti-semitism, or a community about video games, make-up or curating art for galleries. No amount of education is going to encourage jewish people to spend their time talking to openly anti-semitic people about video games. If you permit toxic behaviour then you exclude anybody who feels threatened by that behaviour.