Scientism conceives of objectivity as the opposite of subjectivity, setting up true reality as something unmediated. One consequence of this is the desire to view the world from what researchers

calls a "sideways on" perspective: to see reality from a position outside it. Another consequence is the opposing but equally confused idea of reality as something forever out of the reach of human beings: the notion that our emplacement in the world - the fact that we always engage it from a particular subjective perspective - necessarily condemns us to bias and partiality. 

While it is a mistake to argue that documentarians can access objective reality in this impersonal, natural scientific sense, it is just as mistaken to try and get real mileage out of the fact that they cannot. For what would it be to film the world from no perspective?