How do we organize our world? Robinson Crusoe is a novel that is very interested in hierarchy and man's place in it. At the top, of course, is God. Next up? Well, Crusoe. He rules all that is under him. His moral authority – and his allegiance to God – gives him dominion over other people, places, and things. Xury and Friday, for example, or the animals of the island. For more on Crusoe's hierarchy, check out "Character Clues."
Rules and order are necessary for the maintenance of any society.
The order of the world is hierarchical, with Crusoe somewhere near the top.