It is the case that objective morality, if true, would rest like math ultimately on circular reasoning. X is true therefore X is true.
But yet it forbids, John committed murder for I feel he did. I am right so he committed murder.
If a moral system can only justify itself through circular reasoning, but simultaneously morality forbids using weak or circular grounds to condemn actions, then it undermines itself. Its rules can’t be applied without violating its own standards, making it incoherent as a normative system. In other words, a morality that depends on circular justification cannot consistently tell us what is right or wrong—it collapses under its own logic.
THE ARGUMENT
Introduction:
The concept of objective morality presumes the existence of moral truths that are independent of human opinion or social convention. Philosophers have long debated whether such truths exist and, if they do, how they can be justified. A critical challenge arises when the justification for objective morality relies on circular reasoning—arguing that an action is right simply because it is morally right. This essay explores the implications of circular justification for objective morality, particularly its influence on moral opposition and the nature of moral evaluation, suggesting that such a framework naturally produces a binary rather than a graded moral system.
The Problem of Circular Justification:
Circular reasoning undermines claims of objectivity because it provides no external grounding for moral norms. For instance, stating that “stealing is wrong because stealing is immoral” merely restates the claim in different words, without appealing to an independent principle or evidence. If objective morality rests solely on such reasoning, its authority becomes self-referential, limiting its capacity to guide action in a compelling or universally valid way. In other words, the justification of morality cannot rely exclusively on morality itself; doing so reduces moral rules to internal labels rather than truths with external weight.
Implications for Moral Opposition:
If moral claims are grounded circularly, then the justification for opposing violations of those claims loses independent force. Strong opposition to wrongdoing—such as condemning theft, lying, or harm—depends on the assumption that moral rules have binding authority beyond their mere declaration. Circular reasoning cannot provide that external authority. Consequently, while individuals may continue to oppose moral violations within the framework of the system, such opposition is justified only internally, and not by an objective standard recognized outside the system. This raises questions about the legitimacy of moral judgment and enforcement in a universe where objective grounding is absent.
Binary versus Graded Morality:
A further consequence of circular justification is its influence on the structure of moral evaluation. Without an external metric to assess degrees of moral rightness or wrongness, the system can only categorize actions as either conforming to moral rules or violating them. This produces a binary morality, where acts are either right or wrong, with no objective scale to measure degrees of harm or goodness. In contrast, graded morality—where actions can be more or less right or wrong—requires an independent criterion for comparison, such as the impact on well-being, fairness, or justice. Circularly justified objective morality lacks such criteria, making binary assessment a natural outcome.
Conclusion:
Circular reasoning in moral justification profoundly affects both the practice and the structure of objective morality. By relying solely on self-referential claims, it undermines the independent authority needed for strong moral opposition and restricts evaluation to a binary framework. While circularly justified morality may guide internal decision-making, it cannot claim true objectivity or provide a nuanced hierarchy of moral value. This analysis highlights the importance of seeking external grounding if one wishes to defend both the objectivity and gradation of moral principle.