Nobody is talking about not allowing Facebook to use encryption. In fact, they are explicitly allowed to use it but encouraged not to make it the default settin

Nobody is talking about not allowing Facebook to use encryption. In fact, they are explicitly allowed to use it but encouraged not to make it the default setting. Also, privacy must not be confused with free speech. Free speech rights center on public speech, because "private speech" is not amenable to censure. Surveillance and prosecution of of private communication is neither a violation of privacy nor free speech, but rather an issue of authoritarian legislation. Encryption has absolutely nothing to do with free speech as long as you are in a jurisdiction with an actual right to free speech. If you aren't, well, good luck convincing those authorities. Also, a right to free speech does not entail a protection from all consequences of such speech, only from those consequences a government can dish out.