Anarchy seems like a cool anti-establishment idea, 'til you realize that, in a lawless society, those without rules will probably be the ones who rise to the top.
If law doesn't rule, might will. Need proof? Look at the rise of feudalism in western Europe following the demise of the western Roman Empire. A system developed where armed thugs wielded secular power because they had the ways and means to wage war. Those who fought were supposed to protect those who prayed and those who worked, but it didn't always work out that way.