It's funny, I've argued this point in the past, and it always devolves into the "real" reason for the bloodshed, as opposed to the land-grabbing depicted in the video. I used to say my faith is in humanity, but now I'm not so sure. Of course, we see some of this behavior in other animals, but nowhere near the scale, and certainly for reasons that are more strongly linked with survival.
Humans have a unique way of creating abstract ideas and attempting to make them real. Embarrassing.