The moral impact theory thus seems to fit nicely the way in which theorists of legal interpretation employ normative arguments to defend their theories (see Greenberg 2020, 133–34). And, perhaps surprisingly, on many competing theories of law, it may be difficult to defend the aptness of such normative arguments. Of course, the moral impact theory implies that it is not enough to argue, as theorists often do, that a particular democratic or fairness consideration supports a preferred theory of interpretation. What is needed is an argument that the way in which a theory takes sources to contribute to the content of the law is supported, on balance, by all relevant values.