One look at PBS or listen to NPR screams the answer. There are corporate sponsors on which the “public” endeavors are made to rely. These sponsors run ads in the “public” media they sponsor. In a nation of immense class and race polarity, where illegal wars, the world’s highest incarceration rate, and mass unemployment never end, we get Antiques Road Show and Nightly Business Report and the stuffedest of stuffed shirts mimicking corporate TV news on the one and only “public” television network?
In any event, the obviousness doesn’t mean there aren’t reasons to analyze the beast’s behaviors.
Toward that end, take a look at this from FAIR.