The "marketplace of ideas" clearly doesn't work for the betterment of mankind and the world. Corporate interests throw vast amounts of money into astroturf campaigns, creating propaganda and misinformation, in order to discredit their opponents, who do not have the same access to funds and influence. Google, FB et.al. are part of the problem, with their deep influences in politics. They ban the token nutjob like Icke ever so often, so they can claim they're "doing something", meanwhile their algorithms continue to funnel people from completely ordinary videos to conspiracy theories and virulent content. It's disturbing how quickly this happens on a brand-new profile.
Misinformation spreads like wildfire because it doesn't need fact checks, it doesn't need to be based on research. As long as you can get enough spread, you can get a large number of people to believe anything, simply because they heard it from someone. People are not rational actors.
Witness the demonization of pipeline protestors, people who protest the clear-cutting of forests, people who argue for trans rights. They upset the corporate-run status quo, so they are suppressed by the authorities, who act on the whims of the rich and powerful.
Witness the rise of the alt-right, the so-called "intellectual dark web" and the influence of sites like 4chan and 8chan.
Armed people barging into governmental buildings, and basically being allowed to do so almost unimpeded by police, photo ops for the media, a show of force for their allies. I've seen them ridiculed as yokels, but it didn't matter. What matters is visibility and the "look at what we can do without being stopped" factor.
Imagine what would have happened if BLM, a group of Muslims or any left-wing group had tried to do the same thing. Think Kent State and the National Guard.
The message is clear: Act against capitalism and the powers that be and you will be suppressed, by unlimited force if necessary