News coverage is not liberal. It should be factual. It isn't really factual anymore because the MSM is afraid of being called liberal so they present both sides of a "report" equally. This in itself is ridiculous. I think it has to do with the idea that "News" is now entertainment or punditry rather than reporting. There is no line drawn between the two, it all blends together. So now we never get a "News" report but a conversation about a topic. There just doesn't seem to be any, "Here are the facts that we have learned about an event", it becomes "What do you think about this story, let's discuss it." which isn't "News".
Before the last 10 years where news became entertainment there was a liberal bias by National news reporters because they are more educated and more worldly. By liberal bias, I mean no bias to the status quo. They didn't take sides in the Civil Rights movement because with a more worldly view they knew the world as a whole didn't treat blacks different than whites and the US was backward in that respect. So they reported the facts without making the proposed changes to the laws seem repugnant. Similarly with gay rights, reporters working from NYC knew more gay people than did people in smaller towns and didn't try to color the argument against gays by inflecting disdain into their utterance of the word "gay" or "homosexual". That could be construed as bias but I consider it more educated and worldly.
Any kid from a very small town learns the prejudices that gain them acceptance in that town and internalizes them. If they stay in that town they usually keep them for much of their life (I'm talking pre-internet). If they go to college in a large city and are exposed to more people from more varied backgrounds they begin to see some of those prejudices were based on false assumptions and wrong. So they throw out the prejudice which was based on superstition/suspicion and replace it with a larger reality. This used to be considered critical thinking and a good thing. It has only been demonized in the last 35 years.
PBS is just the one victim they can't outright buy out. So when it still tries to educate kids and broaden their horizons it is demonized. Parents should be able to determine if their kids are thought to think critically. Their remedy to this is that no one should expose their kids to new ideas. It is sad. Or perhaps pathetic is a better word. Sorry, my Liberal Elite colors are showing--"pathetic" is a 3 syllable word which I probably learned by age 12 at my "pinko" high school in a southern 80%+ Republican political district.