If I understand you correctly, I think it has to do with the fact that their narratives don't align with the information. And that's only if the sources are credible (to them), the bias isn't obvious/against the readers bias, and the facts are presented clearly to them (presentation).

So the major barrier to what you & I enjoy as the internet for people to adopt in my opinion, are the communication barriers we all face everyday. You and I most likely are somewhat uncommon because more people are more apt to do their socializing in real life.

That said, we are seeing global communication at it's best. For instance, I'm an anarchist. But more specifically, and libertarian-socialist. One of my many hobbies is to argue with other political theory enthusiasts. More specifically, other Anarchists.

For such a small group of people, it would make more sense to band together in common ideology to become stronger (like the internet), but humans have a way with creating division where there ought not to be none IMO.

Would love you opinion on if removing this division in ourselves is possible, or if you don't believe that's universally true.