Foolish, poorly thought-out review this... seems as though you are close to answering your own questions, but somehow you don't exert yourself enough.
Paterfam001 asks "Why would you put the sequence featuring the most rebellious, anarchic, foul-mouthed characters first?" ANSWER: for the simple reason that it is the OBVIOUS point of view to have...to HATE this crappy job. But the film doesn't fall into obvious traps - it starts with the guys who hate the job (a POV that, as audiences, we relate to) ... and slowly brings us to understand those who obsessively LOVE that very same job. There is nothing random or unclear about this decision - in fact, it is a strategy central to the way this film operates. The film twists our expectations... it doesn't preach to the preached, but flips things "the wrong way round", unlike a typical documentary that feeds us what we already know. We are rarely used to being attacked as so-called "liberal" viewers and that is precisely what this film does... to know this is to understand what lies at the heart of "John & Jane" and perhaps why it makes spoon-fed audiences uneasy. Films like Von Trier's Dogville and Manderlay could also be seen to operate in this way.
I may suggest, Paterfam001, that you stick to the comfort of TV - more specifically, Animal Planet, where whales continue to swim the virgin waters in a simple, happy world.
Unfortunately, the world I occupy in is not that simple, linear, idiotic. It is a mysterious, unfair, strange & complex place, and a film that lives up to the challenge of these difficult times is rare indeed.