Moral Realism
Is 'Cruelty Is Wrong' a Fact About the World?
If you discovered that every culture in history had endorsed torturing children for fun, that wouldn't make it okay — and the force of that intuition is exactly what moral realism is trying to explain.
The Idea
Most people, when pressed, talk about morality the way they talk about taste: different strokes, cultural contexts, subjective experience. And yet almost nobody actually lives that way. When confronted with genuine atrocity — slavery, genocide, the systematic abuse of the powerless — we don't say 'well, that was wrong for us but perhaps not for them.' We say it was wrong, full stop. Moral realism is the philosophical position that takes this instinct seriously. It holds that moral claims aren't just expressions of feeling or cultural consensus, but are genuinely true or false in the same way that claims about physics or history are true or false. Cruelty causes suffering. Suffering is bad. These aren't preferences — they're facts about the world that exist independently of whether anyone believes them. The interesting challenge moral realism faces is metaphysical: what kind of facts are moral facts, and how do we come to know them? They can't be weighed or measured. You won't find 'wrongness' in a chemistry lab. Realists respond in different ways — some argue moral facts are reducible to natural facts about flourishing and harm; others say they belong to a distinct, non-natural category of reality we perceive through something like moral intuition. What unites them is a refusal to let moral language be treated as mere noise. When someone says genocide is wrong, they are not just venting. They are saying something that is true.
In the World
In 1945, at the Nuremberg trials, the Allied prosecutors faced a genuine philosophical problem. The Nazi defendants had, in many cases, acted entirely within the laws of the state they served. To convict them, the tribunal had to appeal to something beyond positive law — to principles that existed independently of any particular legal system or cultural code. The concept invoked was 'crimes against humanity,' a phrase that only makes sense if you believe there are moral truths that no government can legislate away. Chief prosecutor Robert Jackson argued in his opening statement that certain acts are criminal 'whether or not they violate the domestic law of the country where perpetrated.' This was moral realism in action, not as abstract philosophy but as a live question with life-and-death stakes. The Nuremberg judgment was controversial precisely because it rested on this claim: that there are universal moral facts, and that 'I was following orders' cannot dissolve them. When Hannah Arendt later wrote about the 'banality of evil' — her phrase for how ordinary people could commit monstrous acts by suspending moral judgment — she was implicitly defending the same position: that the moral facts were there to be seen, and Eichmann chose not to look.
Why It Matters
This isn't just a seminar-room debate. How you answer the question of moral realism shapes how you argue, how you listen, and what you're willing to defend. If you privately believe morality is just social convention, you're likely to retreat too quickly in the face of pushback — treating moral disagreement as a sign that there's nothing to be right about, rather than as a sign that one of you might be mistaken. Moral realism gives you permission to hold a position, to say 'I think this is actually wrong, not just distasteful to me.' At the same time, it demands intellectual humility — if moral truths exist and can be reasoned about, then you might be the one who's mistaken, not just the person you're arguing with. The practical upshot is a kind of rigorous openness: take moral questions seriously as questions with answers, engage with disagreement as potentially corrective, and resist both the arrogance of certainty and the laziness of relativism. In a culture that often treats strong moral conviction as a sign of closed-mindedness, moral realism offers an alternative: you can be genuinely open to being wrong while still insisting that something is right.
A Question to Ponder
Is there a moral position you hold with complete conviction — and if so, do you believe you're reporting a fact about the world, or expressing something more like a very deep preference?
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