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It's pretty simple, although it may not be obvious. There are 2 different views about "what freedom/democracy is" that are presently doing battle in america, at least among inteligentsia One, the worldview embedded into your comment, is that freedom is about the limits of discourse. Under this system, limiting discourse is inherently undemocratic, so if facebook "censor(s) things they disagree with" this is bad and w…
You're doing a poor job of explaining the first worldview. Which is okay, you've acknowledged that you have trouble understanding it. This worldview has been called the "liberal consensus". What it holds is that the power to determine a discourse is inherently against freedom is corrupting , and by allowing an authority to determine that, it will inevitably be used as a weapon. Goalposts will shift. We will, hmm, go…
I believe the hardcore freedom of speech view has a few important underlying assumptions:
1) More information is better, and shining a light on something is better than trying to selectively hide it, because eventually the real truth comes out through persistent discourse. This is only really possible with the maximum amount of information, and especially all viewpoints laid out on the table with the least amount of obstruction.
2) People are broadly able to parse out untruths, or irrelevant positioning, or anything that is of low quality, and they will not be persuaded by it. This isn't true of everyone, but it is true of enough people; that's an inherent assumption of democracy. We live (or want to live) in a free market of ideas, where ideas can compete, and the market (what people are persuaded by) will be broadly rational and land on the best position in aggregate, even if some people are persuaded by bad or malicious arguments.
3) Limiting the visibility of any information detracts from the overall quality of discourse because it robs people of the ability to improve their thinking. It negates the possibility of refutation, because the untruth is hidden. Giving people all information, including misleading information, in the long-run leads to a population that can have better discourse and evaluation of all the information thrown their way.
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I think the above puts the ideas in the best possible light. However, I disagree with enough of these assumptions that I can't take this worldview myself. My main counter to these ideas is that, similar to (pure) free market proponents, it takes on a very idealistic view of rationality that doesn't match real behavior. In practice, people have to take shortcuts to understand things—it's inherent in human conciseness—and those shortcuts can be exploited. I don't believe this is something we can grow past on a large societal scale, because it's embedded in how we think. To improve the quality of discourse, we have to explicitly protect against these biases. There are a whole host of difficulties there, too, but I think they are more surmountable than all the downsides of allowing deliberate manipulation and misinformation to spread broadly.