This is the really tricky part, though... absolute free expression only prevents people from enacting total control if it persists; however, free speech is not something that can’t be undone.
This is a form of the paradox of tolerance. If people use their absolute free speech to push lies and propaganda that allows them to gain enough control to then suppress future free speech and maintain their own power, we are no longer protected by free speech.
Even if you believe truth always eventually wins out if free speech is allowed, that doesn’t mean that we won’t hit a point along that path where free speech is restricted, and our meandering path towards truth suddenly stops.
Now, I don’t think restricting free speech is the answer, but we can’t pretend that it is impossible for people to use their power of free speech to prevent free speech in the future.