And who gets to decide who gets none?
For example you look at the history and look whether something was more helpful than harmful (eg: fascist propaganda) or you look at the science and look whether something is a real theory or barely an hypothesis whose flaws are well-documented.
Basically, instead of saying "GOP says it's raining and Democrats says the weather is nice", you look at the facts and open your window.
That would set the precedent where if everything I hold dear (...) become relegated to the same "fringe" status by some horrible sequence of events
That scenario exists merely in your slippery slope fallacy. Meanwhile, fascist propaganda has been proven to do huge damage on this very planet of Earth.
Real freedom follows the principle 'the freedom of each person stops where that of others begins'. In the US it seems to mean: 'I must be free to do everything including harming people. If I can't harm others, I'm not really free'
I don't believe that many people believes seriously in 'free' speech absolutism. Are you for abolishing libel laws? Prohibiting non-disclosure agreement? Because they hinder practical free speech more than hate speech laws.