I think this point of view neglects the emergent properties of a society where millions of people can spew nonsense all at once, at the speed of light, using AI assisted audience targeting. Crackpots and liars have existed since the beginning of time but never before has a technology been designed to so readily amplify and reenforce their nonsense. Never before has a technology been so adept at hiding from you that the speaker is a crackpot or liar.
It’s not even just the visibility, it’s the direct harm the actions of these people cause. Whether it’s to their own personal relationships or nation states. QAnon should make a lot of people nervous about the state of unfettered free speech and the idea that the counter to bad ideas is more speech.
"At the speed of light" isn't the problem. We also used to communicate at the speed of light through MySpace, text messages, and so on without these specific problems.