In the old days, the number of available channels for mass-distribution of opinions was low, and people were in general restricted to face-to-face communication

In the old days, the number of available channels for mass-distribution of opinions was low, and people were in general restricted to face-to-face communication with a crowd, or possibly calling a radio show or sending a letter to a newspaper. This made it easy to control the spread when someone voiced opinions or information that were disruptive to society. Today, many people around the Globe have considerably stronger protections of their free speech compared to 50 or 100 years ago, and this combined with the fact that channels for mass-distribution of opinions is now a commodity, freely available to billions of people. Seen in that perspective, social media could be considered a part of the problem simply for being a way for people to voice their opinions, but as you wrote, a "fediverse" would not be more resistant to disruptive opinions. It will be a problem as long a people have a variety of ways to communicate with lots of people.