Even in America, X seems to be full of supremacist accounts - possibly fake bots - that are heavily boosted. Their replies appear at the top under many posts and have far bigger viewership than seems reasonable. I suspect there is significant manipulation of the content on X by X itself. How can anyone know when they don’t have an API to allow deeper access to how it is being used?
But I’m not sure I agree that Twitter is any worse than the rest of them. (Unless you think that only one side is dangerous.)
I wouldn’t be opposed to an under 18 ban on social media. But I’m not sure there is much else than can or should be done. Society needs to evolve enough to be able to live with social media now that the world is connected as it is.