Most societies -- like most religions -- find that things work a whole lot better when they have rules. Given the boundless creativity of human beings, it's just a whole lot easier when people are told very clearly what they can and cannot do.

There are some, of course, who will argue that it is possible to create a utopian society in which boundaries are determined by the individual. That's why there are a bunch of 40-year-olds walking around with names like Moonbeam and Lettuce. Hippie communes died out real fast once those kids hit junior high.