All We Like Sheep

In an extreme case, … only officials might accept and use the system’s criteria of legal validity. The society in which this was so might be deplorably sheeplike; and the sheep might end in the slaughter-house. But there is little reason for thinking that it could not exist or for denying it the title of a legal system.The essence of legal positivism, wrote H.L.A. Hart, is a very simple contention: “[I]t is in no sense a necessary truth that laws reproduce or satisfy certain demands of morality” (185-86).It is tempting to treat this claim—which some have called “the separability thesis”—as a definitional truth about law, i.e., as a constraint on any adequate definition of the term “law.” On this understanding, the positivist maintains that one should not define “law" in a way that excludes some norms from the extension of this term simply because they do not reproduce or satisfy a particular moral demand. Similarly, on this understanding, one should not exclude a system of norms, S, from the extension of the term “legal system” on account of S’s failure to satisfy the demands of justice. Indeed, positivism entails not only that one should not exclude S on this ground, but also that the injustice of S is not even a reason for regarding S as a problematic or marginal or less-than-central case of “law.” The positivist holds that it is a mistake to build moral conditions into the definition of “law” in any way whatsoever.