Earlier quoted context omitted.
And that's where problems arise. Most of us are comfortable oppressing people we disagree with. The reality is that you can't silence voices you don't like without making yourself vulnerable to the same treatment. We either value the freedom to express ourselves within the limits of the law or we don't. As soon as there are more people who think like you do, none of us are safe and it just becomes a system that silen…
If you don't believe in freedom of speech for people you hate you don't believe in it at all. The refusal to use force to stop opinions the majority doesn't like is the only thing that makes any progress possible. Being able to say things other people want to stop you from saying is the defining characteristic of free speech.
Private people, groups, companies though? Not only may they curtail speech more or less arbitrarily in places they own, I believe quite firmly that they may respond to the exercise of freedom of speech by exercising their freedom of association and refraining from further commerce with the speaker because of the information the speaker has revealed. And with very few, narrow, specific cut-outs, American law agrees with that premise.