I re-read this several times but I can’t break out of the thought that this is such a naive and simplistic view of the world, and perhaps that is the problem with all of these theories.
Democracy requires an informed electorate. Sources of information are now everywhere and many are not vetted, meaning that right now, more than ever, facts are weapons. Because electorates vote on their beliefs, and information informs those beliefs. This has been true for, at least, centuries.
The idea that “freedom to speak” results in better decision making assumes that 1) those creating information are acting without bias, and 2) that their source information is itself accurate. This, too has been true for even longer - for millennia control over the written word and what could be spoken controlled vast swaths of the population, democracy or otherwise.
For the first time in history, we have platforms like Twitter that have given everyone the power to speak, without an increase in the ability of individuals to vet that speech for factual accuracy. We will fix this eventually (see projects like WikiTribune for that), but until we do, platforms that elevate speech based on bigotry, misogyny, and hatred further muddy the waters and result in even more difficulty determining factual accuracy while simultaneously giving the impression that there is an “equal divide” between Nazis and the alt-right and the rest of the world who would like to find solutions that don’t involve hating on brown people, women and anyone not in power structures that exist today.
One powerful way to do that is through social pressure. If the Nazis of the world want to start a HeilTwitter, go ahead. They will run into the reality that few people actually have any interest in supporting them, and that’s the appropriate response to groups intent on genocide.
Democracy was not created to give purveyors of hatred and bigotry a guaranteed platform against social pressure. This “deplatforming” you are seeing is literally democracy in action, just with the “votes” being what platforms one uses, what events one attends, or what groups are supported, instead of what vote is cast.
The simplistic idea that “deplatforming” of anyone is bad even if it’s socially unwelcome" is the exact opposite of the cause you seek to support. Imposing socially indefensible ideals on the public in the name of “freedom” is a very different political ideal from the one you are attempting to defend.