Because NPR isn't owned by someone who is concerned to make money for themselves or stockholders. Profit isn't a motive. Truth is. Rupert Murdoch or the Koch brothers or the Kennedy family or whoever can't control this kind of news or analysis. If you treasure democracy, you must treasure independent sources of information because you cannot vote well if you cannot get good information.
I for one do get annoyed at NPR from time to time because it seems to me that they bend over backwards to allow some voices to be heard that I really don't want to hear. But I know they need to be heard, and I myself NEED to hear them. But as I've said on this blog before, I also consult a variety of newspapers and news sources, such as the BBC and Al Jazeera (both the online news source and the magazine -- don't be afraid, you won't get "Muslimized" or something if you go to their site. But you will definitely get a different view of the news, and your view of the US may indeed be challenged. Even if you don't agree, you'll have to do a better job of defending your point of view! If you can't take that and deal with it, you have no claim to be pursuing the truth. So stop telling the rest of us that you are.).