These documentary films are primarily designed to provide instruction or education, or to maintain an image for the organization. This raises awareness and brings a sense of legitimate academia to the presentation. 

In documentaries, we see more often than not that the action of the evolving environment is what drives the narrative and the story without making it appear scripted or forced. This organic story telling method makes people feel that they are right in the middle of the action, as opposed to being led on by a rigid framework. This has the added effect of making the audience feel more connected with the content and the producers. You want this effect to be magnified so that retentions, overall, are increased.