When individuals are in charge of their own destiny rather than subject to the “mortal god” state, I believe they have reasons for co-operating with each other. The wars of the state or the Hobbesian ideal of the centralised state created Sparta, the early Islamic Empire, Prussia, Nazi Germany and led to WWI and II
Nature is pure war with every man against another. Fear of death is the only way to keep the peace, so man is civilized by the threat of violence against him for transgressions upon his neighbor.
It doesn't always work...