A good documentary looks something like Dark Days. Good because it does not interfere with the study of the individuals it films, good because it blends emotion without sentimentality, blends art with presentation, and evokes interest without being condescending or overly simplistic. That is what a good documentary should contain. You know what we call heavily biased 'journalism' in the real world? Propaganda. Bowling for Columbine was a left wing propaganda film.

I am a leftwinger myself, incidentally.