> this film remains relatively neutral/ambiguous [...] with ambiguous subject matter?

There's a big difference in ambiguousness and ambivalence, especially in documentaries. "Ambiguousness" represents an uncertain logical conclusion, whereas "ambivalence" stands in for (the strength of) conflicting forces.

I'd wager that an ambiguous documentary would be close to being unwatchable, and I can't remember that I've seen any. Since I've yet to see You Can See Everything, unfortunately I can't comment about it in any way.