We cannot simply hand-wave some of them away as "the struggles every new medium faces."
Printed materials were still pretty gate-kept. Sure, anybody could spend a modest sum and get a bunch of roughly-printed pamphlets printed up. You could walk around London and hand them out. People did, and I suppose some of these ideas got traction. And some of those ideas were even good.
That was still a lot of money and effort, and it was still a lot of work to establish some kind of credibility so that your ideas might actually gain acceptance. Otherwise you were just a crazy person handing out pamphlets along with all of the other crazy people.
Today, you can post insane and dangerous COVID-19 falsehoods to half of the freaking world via YouTube or Facebook and your message is indistinguishable from ideas presented by people who actually know what they're talking about.
The gatekeeping America used to have was... not great. Network television's self-censorship was often stodgy, at best. But you didn't have absolute fucking lunatics screaming about chemtrails and Bill Gate's 5G microchip mind-control scheme racking up literally millions of followers. That is a PROBLEM.
If you say to me that the ideal solution is to simply have a more educated populace, I wouldn't disagree. However, that doesn't solve things now. We need long-term solutions (education) as well as short-term ones (so we don't have the loonies electing other loonies who actually get to steer the most powerful militaries on the planet)