How clear can it be? Some people would rather hear what they want to hear than the straight news.
These people don't want to hear both sides, or a range of sides, and then think about it for themselves. They don't watch the news to learn, to grow, to be informed or edified, they want to see 'news' that reinforces their prejudices. And for some strange reason, many more of these people are conservatives. That's why Fox does so well while Air America failed--because libs didn't want to just hear biased news, even if it was biased in their own direction.
I blame this on the 'Reagan Revolution'. Reagan presented a view of America that was total fantasy, but a lot of Americans just desperately wanted to believe it. They longed to believe that big tax breaks for the rich would pay for themselves by stimulating the economy, that 'social justice' was a fake issue, that racism was dead years ago, and that 'the Democrat Party' was really socialist or communist. They believe that to this day! Their party encourages them to see 'truth' through a totally partisan lens. In fact, any news outlet that doesn't shamelessly twist the news to fit their fantasies is called 'liberally biased'--which led Stephen Colbert to state that 'Truth has a liberal bias!'.
Libs are like that a little bit but not nearly as bad as Republicans.