Freedom of expression is not a human right. It is a natural right. 

It is not granted by society, but by God. 

No matter the infringement on this right, one can always practice it freely in some way, in private, or even in their own head. 

Contrast this with a human right, something like safety. Safety is a human right, granted by society, and not a natural right granted by God. 

One’s safety can be taken by another (although the right to defend oneself is natural), it can be taken by a criminal, the government, etc.

Freedom of expression is not the same, like the right to bear arms, one can attempt to infringe upon it, but the exercise of these natural rights can never be truly prevented.