But another angle, that seem to describe more closely the long term evolution and progress of human societies, is that laws and ethics have been slowly built by human societies against the law of nature. The direst way to express this is that in a natural environment, the weak and the disabled are left aside and die quickly, which we humans have decided to try hard to avoid.
So maybe a softer, more informal, "stateless" society like this Xeer could be valuable. But if it was, it would be because it would better protect us from the law of nature.