Moral Uncertainty and the Criminal Law

  • Christian BarryEmail author
  • Patrick Tomlin


In this chapter we introduce the nascent literature on Moral Uncertainty Theory and explore its application to the criminal law. Moral Uncertainty Theory seeks to address the question of what we ought to do when we are uncertain about what to do because we are torn between rival moral theories. For instance, we may have some credence in one theory that tells us to do A but also in another that tells us to do B. We examine how we might decide whether or not to criminalize some conduct when we are unsure as to whether or not the conduct is morally permitted and whether or not it is permissible to criminalize the conduct. We also look at how we might make sentencing decisions under moral uncertainty. We argue that Moral Uncertainty Theory can be an illuminating way to address these questions but find that doing so is a lot more complicated than applying Moral Uncertainty Theory to individual conduct.


  1. Ashworth, Andrew. 2006. Principles of criminal law. 5th ed. Oxford: Oxford University Press.Google Scholar
  2. Barry, Christian. 2005. Applying the contribution principle. Metaphilosophy 36: 210–227.CrossRefGoogle Scholar
  3. Barry, Christian, and Patrick Tomlin. 2016. Moral uncertainty and permissibility: Evaluating option sets. Canadian Journal of Philosophy 46: 898–923.CrossRefGoogle Scholar
  4. Blackstone, William. 1765. Commentaries on the laws of England. Oxford: Clarendon Press.Google Scholar
  5. Bykvist, Krister. 2017. Moral uncertainty. Philosophy Compass 12 (March). Scholar
  6. Edwards, James. 2014. Harm principles. Legal Theory 20: 253–285.CrossRefGoogle Scholar
  7. Feinberg, Joel. 1984. Harm to others. Vol. 1 of The moral limits of the criminal law. New York: Oxford University Press.Google Scholar
  8. ———. 1985. Offense to others. Vol. 2 of The moral limits of the criminal law. New York: Oxford University Press.Google Scholar
  9. ———. 1986. Harm to self. Vol. 3 of The moral limits of the criminal law. New York: Oxford University Press.Google Scholar
  10. ———. 1988. Harmless wrongdoing. Vol. 4 of The moral limits of the criminal law. New York: Oxford University Press.Google Scholar
  11. Guerrero, Alex. 2007. Don’t know, don’t kill: Moral ignorance, culpability and caution. Philosophical Studies 136: 59–97.CrossRefGoogle Scholar
  12. Gustafsson, Johan E., and Olle Torpman. 2014. In defence of my favorite theory. Pacific Philosophical Quarterly 95: 159–174.CrossRefGoogle Scholar
  13. Harman, Elizabeth. 2015. The irrelevance of moral uncertainty. In Vol. 10 of Oxford studies in metaethics, ed. R. Shafer-Landau. Oxford: Oxford University Press.CrossRefGoogle Scholar
  14. Husak, Douglas. 2008. Overcriminalization. Oxford: Oxford University Press.Google Scholar
  15. Jackson, Frank, and Michael Smith. 2006. Absolutist moral theories and uncertainty. Journal of Philosophy 103: 267–283.CrossRefGoogle Scholar
  16. Lockhart, Ted. 1991. A decision-theoretic reconstruction of Roe v Wade. Public Affairs Quarterly 5: 243–258.Google Scholar
  17. ———. 2000. Moral uncertainty and its consequences. Oxford: Oxford University Press.Google Scholar
  18. MacAskill, William. 2016. Moral uncertainty as a voting problem. Mind 125: 967–1004.CrossRefGoogle Scholar
  19. MacAskill, William, and Toby Ord. 2018. Why maximize expected choice-worthiness. Noûs.
  20. Moller, Dan. 2011. Abortion and moral risk. Philosophy 86: 425–443.CrossRefGoogle Scholar
  21. Nagel, Thomas. 1991. Equality and partiality. New York: Oxford University Press.Google Scholar
  22. Ross, Jacob. 2006. Rejecting ethical deflationism. Ethics 116: 742–768.CrossRefGoogle Scholar
  23. Sepielli, Andrew. 2006. Review: Ted Lockhart, moral uncertainty and its consequences. Ethics 116: 601–604.CrossRefGoogle Scholar
  24. ———. 2009. What to do when you don’t know what to do. In Vol. 4 of Oxford Studies in Metaethics, ed. R. Schafer-Landau. Oxford: Oxford University Press.Google Scholar
  25. ———. 2012. Normative uncertainty for non-cognitivists. Philosophical Studies 160: 191–207.CrossRefGoogle Scholar
  26. Tadros, Victor. 2011. Harm, sovereignty, and prohibition. Legal Theory 17: 35–65.CrossRefGoogle Scholar
  27. Tomlin, Patrick. 2013. Extending the golden thread? Criminalisation and the presumption of innocence. Journal of Political Philosophy 21: 44–66.CrossRefGoogle Scholar
  28. ———. 2014a. Retributivists! The harm principle is not for you! Ethics 124: 272–298.CrossRefGoogle Scholar
  29. ———. 2014b. Could the presumption of innocence protect the guilty? Criminal Law and Philosophy 8: 431–447.CrossRefGoogle Scholar
  30. Unruh, Charlotte. n.d. Moral uncertainty as a real-world problem. Unpublished m.s.Google Scholar
  31. Weatherson, Brian. 2002. Review: Ted Lockhart, moral uncertainty and its consequences. Mind 111: 693–696.CrossRefGoogle Scholar
  32. ———. 2014. Running risks morally. Philosophical Studies 167: 141–163.CrossRefGoogle Scholar

Copyright information

© The Author(s) 2019

Authors and Affiliations

  1. 1.The Australian National UniversityCanberraAustralia
  2. 2.University of WarwickCoventryUK

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