It would be good if they can get both sides and views in the same documentary.
Not necessarily. It depends on what the story in documentary is about. Absolutely nothing wrong with one POV in documentaries. Real devil is editing and narration which isn't structural in its function. By structural narration I mean narration written only to shorten some prologues to sequences in the story structure itself. With narration and editing you can distort your story in any way possible. I found out, through experience, that with sensitive subjects it's best to avoid narration altogether and tell story only through editing. Careful editing, where you weave story only through what you've been told by carefully selected interviewees.