You haven’t paid much attention to the internet if you still think that allowing people a worldwide platform doesn’t have inevitable downsides.
The internet is the same as the other mass media when it was newly invented. The printing press didn’t change how people were, it just allowed them to reach wider audiences. Without the printing press, Martin Luther is just a guy. Without Twitter, Trump is also just a guy.
Facebook does connect people. Billions of people log in every day to see what their friends and family are up to. You might find that far fetched because you don’t know anyone who does, but that’s just your bubble.
The issue with Facebook is that making communication free has consequences. Those consequences are what Facebook gets blamed for. But this would happen regardless because it’s a direct consequence of the internet making communication free.