Can a legal system be immoral and still be considered true law?

Ideas & Philosophy · Published 3 October 2026 Swipe more like this →

In short: John Finnis, a prominent Australian legal scholar, challenges the positivist view that law exists independently of morality. He argues that we must identify central cases of law—those where a genuine moral obligation to obey exists—to properly understand the nature of legal systems and their authority over human society.

Finnis, a Thomist philosopher and long-time professor at Oxford, is best known for his 1980 work, Natural Law and Natural Rights. In this text, he provides a modern restatement of natural law doctrine, arguing against legal positivists like H.L.A. Hart. While positivists often separate the existence of a law from its moral quality, Finnis contends that a theory of law must focus on its central cases. For Finnis, these are instances where the law carries a genuine moral weight, rather than merely being a set of rules enforced by power.

This framework addresses the difficult problem of how to categorize regimes that authorize immoral actions, such as the Nazi legal system. Finnis argues that such systems do not represent the central case of law, a distinction that clarifies why prosecution for actions sanctioned by those regimes remains morally appropriate. His approach emphasizes that human freedom is essential, as individuals must make choices among various basic human goods. He identifies eight such goods, including life, the pursuit of knowledge, play, aesthetic appreciation, social friendship, practical reasoning, religious engagement, and marriage.

Beyond his theoretical work, Finnis has had a distinguished career as a jurist and adviser to Australian governments. Educated in Adelaide and later at Oxford as a Rhodes Scholar, he has supervised influential legal minds, including U.S. Supreme Court Justice Neil Gorsuch. His career spans decades of teaching at institutions like Oxford and Notre Dame, alongside practice at the English Bar. Although his natural law ethics have found their most enthusiastic reception among Roman Catholic philosophers, his work continues to spark debate on the intersection of intentionality, prudence, and the common good in modern jurisprudence.

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