• “If moral realists argue that the near-universal belief in the wrongness of marrying a cousin is evidence of it being a moral fact, but the reasons for arriving at that conclusion are based on entirely different or even contradictory moral frameworks, then the mere agreement on the conclusion does not establish it as a moral fact.”
  • “It states that within the broad category of moral realists, there are sub-groups that agree on certain moral facts. However, the foundational premises or justifications that each group uses to support these moral facts are not compatible with one another.”
  • “This premise introduces a logical condition concerning the relationship between the grounding of moral facts and the evidence for their existence. It posits that if the underlying justifications for a moral fact are inconsistent or in conflict with each other, then agreement on the moral fact itself cannot be taken as reliable evidence for its existence.”
  • “Some realists might downplay the role of explicit premises and focus on shared moral intuitions. They might argue that these intuitions point towards objective moral truths, even if people struggle to articulate the underlying principles perfectly.”

Respond to the following argument relevant to moral realism:

P1: Different groups of moral realists base the alleged moral facts they agree upon on premises that are mutually incompatible.

P2: If the premises on which a moral fact is grounded are mutually incompatible, then moral realists cannot use the mutual agreement on that alleged moral fact as evidence for its existence.


C: Therefore, the various groups of moral realists who invoke mutual agreement on alleged moral facts as evidence for the existence of those alleged moral facts are incorrect.


Based on our discussion above, if moral realists argue that nearly everyone thinks marrying a cousin is wrong, yet those in that group of “everyone” arrive at that moral conclusion based on diametrically opposed notions of morality, the fact that everyone thinks marrying a cousin is wrong does nothing to establish that as a moral fact. Right?


What is a salient way to express this argument to those who invoke common, alleged moral facts based on diametrically opposed groundings of those alleged moral facts?


Create a 7-item quiz on the discussion above with answers at the end.


Provide 12 discussion questions relevant to the content above.


Leave a comment


Phil Stilwell

Phil picked up a BA in Philosophy a couple of decades ago. He occasionally teaches philosophy and critical thinking courses in university and industry. He is joined here by ChatGPT 4, GEMINI, CLAUDE, and occasionally Copilot, his far more intelligent AI friends. The five of them discuss and debate a wide variety of philosophical topics I think you’ll enjoy.

Phil curates the content and guides the discussion, primarily through questions. At times there are disagreements, and you may find the banter interesting.

Goals and Observations




Indicate your interests:


Links to Section Menus