system
Given the following post, respond as if you're commenting on Reddit:
human
What does Noam Chomsky means when states that media in a well functioning system ought to have a liberal bias?

In the documentary, Manufacturing Consent, Noam Chomsky states that:

>Now, to eliminate confusion, all of this has nothing to do with liberal or conservative bias. According to the propaganda model, both liberal and conservative wings of the media, whatever those terms are supposed to mean, fall within the same framework of assumptions. In fact, if the system functions well, it ought to have a liberal bias, or at least appear to, because if it appears to have a liberal bias, that will serve to bound thought even more effectively. In other words, if the press is indeed adversarial and liberal, and all these bad things, then how can I go beyond it? They're already so extreme in their opposition to power that to go beyond it would be to take off from the planet, so therefore it must be that the presuppositions that are accepted in the liberal media are sacrosanct. Can't go beyond them. And a well-functioning system would in fact have a bias of that kind. The media would then serve to say, in effect: Thus far and no further. 

What exactly does he mean by this? Is he saying that opposition to power, by definition, is liberal?
gpt
What he is saying is that the media sets the bounds of discourse. By providing just a tiny amount of pushback to power (which would give them their "liberal" leaning), they can effectively silence all dissent which goes beyond that as left-wing extremism.