Well, what he's trying to say is probably "just" showing the desolate human landscape in Mexico, where people live in two directions which cannot easily be reconciled. The only hope lies in recognizing and facing this. And through this film the viewer might be able to come closer to this goal. After all, the problems presented are universal and not only restricted to Mexico.
Part political pamhplet, documentary on everyday life, abstract allegorical play, and satire, connected through image and sound. It's simply cinema. 

But I don't have anything controversial to add really. I think the film does enough of it