In nearly all cases 'public square' platforms for political discussion should have no say about the merits of what someone is saying.
yet these are not 'public squares', thus they're free to manage content as they see fit.
Yet they are. Twitter is where a significant percentage of political discourse happens. It bring privately owned doesn't alter it's role in US democracy.
No, they're not. They're resources operated by a private company. They're not public property, nor are they regulated as a utility.
Wishing it were true doesn't make it that way.
Nobody is saying Twitter is publicly owned. You didn't read the comment you replied to: