If that's what were happening you'd probably have a point, but it isn't. "Not deleting" something is not the same as providing the audience, nor amplifying.
And, by the way, yes free speech does imply some obligations on the rest of us. Speech is not free if you are not free to exercise it; "you're free to talk in a prison cell" type of thinking isn't productive because it avoids the entire conversation.
Free speech has absolutely nothing to do with the government, by the way. Just because one country wrote down something called "The 1st Amendment" doesn't mean that somehow free speech only exists in that country and only when the government gives it to you. Free speech is a natural right that we all have and nobody has the right to silence anyone else: The 1st is simply one aspect of that.
The fact that society at large has lost that value cannot be viewed as a good thing and all the people in this thread defending the silencing of millions because they disagree with them politically is beyond shameful.