People of all political persuasions would be best, so they can counterbalance one another. I, for example, would be tempted to ban all Biden supporters, but that would not be what free speech is about. Even stark raving mad socialists like Greta Thunberg have a right to say what they think, as long as there’s no vulgarity or threats of violence included.
Let's have a giant brawl of ideas and let the best ones win.
Twitter can be a forum for such a fight.
And Musk is right. If such a fight gets started, it will be impossible to resist the urge to join in.
Your logic is what has allowed pornographers to proliferate. None of the above has any relation to the 1st Amendment.