In my own experience driving for a little while around the Four Corners area in the desert, there were more than a few spots where the only option was NPR, because all other stations on the dial were glassy-eyed christian proselytising, especially driving Utah -> Colorado. I mean, the kind of radio that even normal christians would be uncomfortable listening to. I like NPR's content anyway, but if you lived in some of those areas, it's the only option that isn't cult-ish.