Yep, there should not be bias in radio, news papers or TV, but since you and I also have biases we possibly could be a little forgiving when others do also. There are about 170,000 public radio funding contributers here in the area where we live. They all have biases; a few are conservative and more are liberal or libertarian.
Some here consider public radio to be very conservative and some very liberal and some reflective of the population here abouts. Personally I think they lean liberal; certainly not conservative but they do seem to try to be middle of the road. Mostly they report the liberal news but try not to push the agenda much unless an NPR commentator gets on a rant. I'll give a C or C-.
Have been reading Elton Trueblood's The Company of the Committed (1961) where he paraphrases Dostoyevsky's The Brothers Karamazov "We have seen in these countries (Russia & China) the fulfillment of the dire prediction of Dostoyevsky that the time would come when the greatest change was not that of a church becoming a state ... but rather that of the state becoming a church."
I'd say we are there now. But in the USA there are two religious factions competing to lead this new church, the Republican's and the Democrats. And like in most religious battles, each faction wants to wipe out the other.
The problem, however, is that we believe in the state as our "church". Therefore what ever our sect believes must be true and godly while the other sect is demonic and ungodly and we are justified in what ever we do to defeat them.
Of course neither way is Godly!