                   Still, descriptive social theory is only a subordinate aspect of natural law theories of law. Their primary focus is typically on identifying the conditions under which law is justified, both in the sense in which law can and should be preferable to anarchy or tyranny or even benevolent “rule of men,” and in the sense in which this or that legal principle, institution or rule can be judged to be preferable to alternative reasons or purported reasons for action. As Green 2003 says: