Can a true documentary be biased?

Question

What is the actual "definition" of a documentary? Must it provide an objective view on all points of an argument or can it have a slant of its own to make a new argument? What is the line between a documentary and propaganda?

Answer 1

the usually documentary is slanted because those that produce and make it have special interests.  pbs is the worst.

Answer 2

The person making the film is selecting facts to support thier beliefs.

Answer 3

Most of them are. A documentary is usually made to tell a true story, or to give personal views. It is definitely not required that the views are objective. That is why so many are controversial. Fahrenheit 911, for example.