:I agree with most of what you say, except for differentiating between "political" and "mainstream". Every source in the article has some kind of bias, and every opinion piece written about this movie has an identifiable political slant. The "extremist" thing is silly. Breitbart is well within the conservative mainstream, and indeed is the highest trafficked conservative news/opinion site. Gallup polling has consistently shown over the years that about twice as many Americans identify as "conservative" as "liberal" (roughly 40%-20%), so it would be absurd to dismiss conservatism itself as "fringe". If anything, Breitbart is less fringe than far left outlets like Kos, Salon, and Media Matters. If one is trying to define a "fringe" view as something other than not having widespread popular following (which would be odd in a political context; this isn't a scientific issue), there's still the question of why allegedly being "fringe" would even matter to our coverage of such opinions if the views are directly pertinent to this article, which they clearly are since it's a conservative documentary.  

 :If our task is to cover the political reception to a film, then we can't ignore the elephant in the room (so to speak). The noteworthy political views should all be covered with attribution. It's especially silly when only one Breitbart inclusion is being singled out by an editor for removal. Does he not oppose the others?