Getting someone fired for saying shit you find deeply offensive is not a betrayal of the principle of Freedom of Speech.
Something that everyone needs to keep in mind is the first amendment is a legal concept in place to stop THE GOVERNMENT from restricting speech, meaning they can't put you in jail for speech. Regular citizens, on the other hand, also have the right of free association, meaning they can remove people from their property for any reason, including speech. A company has every right to fire someone for bringing them bad PR. Otherwise youd go into a store and the cashier could tell every customer to eat shit and they wouldn't be able to fire them, which is not a world anyone wants.
Understandably, making actionable threats or spreading lies/slander that can be proven false don't fall under freedom of speech, as in one could face legal consequences for it. Personally, I'm fine with people getting fired for making their workplaces look bad, if their words are attached to their public name. Hunting down anons online and doxxxing is a different story.
What I'm seeing from others is that there's this fear, or concern, somehow that this will turn into something worse. There's a misconception that using their tactics against them will lead us to behaving as bad or worse, even once they're no longer in power. Rational people won't go that far, but it doesn't help that some talk as though going down into the pit with them is the permanent way forward.