Seems to work pretty well, so far as I can see.

If anyone really wants to post something that would be liable to get excised - for example a personal attack on somebody, or a bunch of racist remarks - all they need to do it stuck it up on a website of their own, and put a link to it in a post here. I very much doubt if that would get removed, so everyone could be happy. Total freedom to say what you want, and total freedom for anyone else to click on the link and read it.