You are massively confused. All human beings on earth are members of protected classes. Furthermore, foreign governments are not a protected class.

And being a member of a protected class doesn't mean you can't be banned for terms of service violations. You are just throwing legal sounding words together like a random word generator.

The same foreign governments that regularly get sanctioned? Doesn't seem very "protected" to me.

Right, but it’s not Willy-nilly. There is a process and chain of command, etc. It’s not something someone in the state department wakes up and decides, eh, I don’t like what Castro said. Let’s sanction them now. No, they have to offer reasons and go through chain of command.

You seem to be conflating "protected" with "requiring diligence before action is taken". You simply can't fire someone for being in a protected class. No amount of "process and chain of command, etc" is going to change that. It's not like you can't be fired by a manager willy-nilly for being black, but if it goes all the way up to the CEO it's totally fine.

Twitter is not part of the government so that is not relevant here (and I find that highly dubious to begin with). And no, you can’t ban one or every one of a protected class based specifically on that factor. You can still be banned for other reasons.