We live in a country where John Lennon takes eight bullets, Yoko Ono is walking right beside him and not one hits her. Explain that to me!
Writers are not always right however, but then again, I've been on shows where the actors have complete control and change everything and it's terrible.
This is indeed not only relevant to Documentary but is evident is most type of film making. The film often mirrors the experience, understanding and politics of the director.

