There is a distinction between what is something you ought to do and what is legal. It is legal to drink yourself to death. It is probably not a good idea. The distinction is not a small one. Let's apply it to the social norms many people suggest we adopt on silencing others.
I hear quite frequently arguments to the effect that private platforms are legally _allowed_ to silence people. And yes, they are, and yes, they should be. Is this a good idea, though? Let's have a quick look for a moment.
It's possible to imagine a society where every restaurant refuses service to people of the wrong political background, every supermarket checks to see if people arriving match a particular political affiliation before selling them groceries.
We can imagine neighbors only talking to other neighbors of the correct political tribe, jobs refusing to allow people with the wrong political beliefs to apply, etc. This is probably a thing that is legal or at least ought to be legal.
Is it, however, a recipe for a peaceful society? Or would it ultimately lead to something more bloody than the wars of religion during the Protestant Reformation?