I don't expect the audience cares very much about this, though, which is sort of to OPs implied point. We've reached a place where each side of the political spectrum is not only happily ignorant of the other side's good points, but in fact, fearful of even having the discussion. If you go too far afield from the party line, you will be punished, and public radio (along with non-public radio, cable, broadcast news, and most other forms of legacy media) is a shrinking market, unwilling to alienate the core audience.
(The shorthand term for this is "audience capture", and IMO, This American Life has a death grip on a very particular sort of audience, which even if you set partisan politics aside, is representative only of itself.)