Most nature documentaries don't leave it at that, though. They present facts, but then weave them into a narrative. I don't know why this "weaving a narrative" is something they all do.
...maybe they teach that at film school or something. Science itself has no narratives.
And at some point in the 90s, it seems to me that someone decided that the narrative for all nature documentaries was going to be: Man is destroying nature.
It's all this same weird psychology, where man loves to set up systems to keep reminding him that he's a sinner. The political right, in the U.S., gets their weekly fix in church. The political left works the message into nature documentaries instead. I wish both sides would stop evangelizing. I really kind of want to just say "No, thank you" in the same way I would say "No, thank you" to a Jehovah's witness knocking at my door.