If you have a centralized system with Sean Hannity getting on the television and saying things which are clear, simple and wrong, you still have the exact same problem. Decentralization can only improve it because then it's not only him and the more complicated truth is at least available instead of the simple lie being the only thing on offer.

And this is what I mean by "in a way its would-be victims can see it".

People don't have time to investigate every throw-away simple lie, but it gives you the opportunity to sample. You follow Bob and he says a bunch of stuff and every time there is a whole complicated discussion that you usually don't read because you don't have time. But once in a while you do.

If every time you do, it turns out Bob is right, you can be more confident that the stuff he says is usually right even when you don't have time to check. If every time you do, it turns out Bob is wrong, the opposite. It provides the opportunity to evaluate credibility.

But that only works if you have a system where anybody can reply to anything and actually be seen. If you have a system where a central gatekeeper can make criticism and counterarguments invisible, you lose.

We already have largely decentralized speech in the US via the internet. And much like how the printing press gave everyone a voice or how radio created Hitler, the internet is the modern age vehicle of populist messaging.

The reason someone like Trump can rise to power and consolidate said power is because he speaks simple and lies work in a decentralized system. Populist messaging is built on the fact that humans are naturally drawn to simple solutions and emotional responses. 90% of the time throughout American and European history, if you just tell people "this is ethnic/racial group X's fault!", that works.