  The political-theoretical part of natural law theory explains and elaborates the grounds and proper forms of governmental authority. It explains the similarities and differences between the practical authority of rulers (including democratic electors acting as selectors of representatives or as plebiscitary decision-makers) and the theoretical authority of experts and persons of sound judgment. It shows the grounds for instituting and accepting practical authority as an almost invariably necessary means for preventing forms of harm and neglect which, because contrary to the high-level moral principles (at least as they bear on relationships between persons), involve injustice. Political theory subsumes, as one of its branches, legal theory. As legal theory, political theory explains the normal desirability that governmental authority in political communities be exercised within the framework of (in the classic slogan) a “rule of law and not of men” (1.3).