Who is to judge fairness?

In Japan, there is a series of controversial dialogues going on between the government and the media, especially the terrestrial television stations.
The government says that the tv news coverages need to be fair and balanced.

Fair enough. But who is to decide?

Generally speaking, I think it is a bad idea for the government to decide what is fair and what is not.
We need a third party to make a fair judgment on fair reporting.

It comes as a surprise that this simple organizational wisdom does not cross the minds of those in the power.

It puzzles me.