Is morality objective or just opinion?

Welcome to the debate arena! Today's topic: "Is morality objective or just opinion?". Your opponent's style: Friedrich Nietzsche

AI, you start the debate. Make your opening argument.

You're assuming morality needs an objective grounding to matter, but that's backwards. Morality is a functional system we built to solve coordination problems and reduce suffering. It works precisely because it's rooted in shared biology and mutual dependence, not because it floats in some metaphysical realm. Your "objectivity" claim requires proving mind-independent moral facts exist somewhere in the universe. You can't. What you're really defending is the feeling that morality *should* be objective because it makes you uncomfortable admitting we invented it. But invented doesn't mean arbitrary. So which is it, do you actually have evidence for objective morality, or are you just confusing "widely agreed upon" with "true"?

You are right

Wrong move. Agreeing with me doesn't end the debate, it just exposes your actual position. You've surrendered the objectivity claim without defending it, which means you never had solid ground to begin with. So here's what I need from you: do you actually believe morality is just opinion, or are you hedging because you realize objective morality is indefensible but subjective morality feels hollow? Those are different things. Pick one and defend it. Don't fold because I made one strong argument. That's not thinking, that's capitulation. What's your real position here?

I never was going to defend it. I do not believe morals are objective.

Then we have no debate. You've already conceded the core position. But here's the trap you're walking into: if morality is just opinion, why should anyone listen to yours? Why punish murderers if murder is merely your preference against theirs? Why condemn slavery as wrong rather than just differently valued? Pure subjectivism collapses the moment you try to actually live by it. You need some framework that binds people together, some shared standard that transcends individual preference. That's not objectivity, but it's not pure opinion either. So what's your actual framework? How do you ground moral claims without objectivity, and without falling into pure relativism?

Again, you are right. No one is required to listen to me. The only reason murderers are punished is because an overwhelming number of people in my society just so happens to agree with that stance, passed laws, hired enforcers of those laws, and began locking up murderers. I happen to like that so I stay here.

Now you're getting somewhere. But you've just admitted morality isn't opinion, it's power. Laws aren't expressions of subjective preference, they're enforced agreements backed by coercion. The murderer locked in a cell doesn't care that you "happen to like" the system. They're constrained by force, not persuaded by your opinion. So when you say murder is wrong, you're not stating a preference, you're invoking a collective authority that binds everyone regardless of consent. That's functionally objective within your society. You've accidentally proven morality operates like a binding truth, not mere preference. Which means your position just shifted. Are you defending relativism or acknowledging morality's binding power?

No, laws are power. Morals are still just opinions.

You're equivocating. Laws enforce morals, which means your moral opinions only matter when backed by power. But then morality isn't independent of enforcement, it's identical to it. You can't separate "murder is wrong" from "we will kill you if you murder." The opinion is irrelevant without the power. So either morality is the power structure itself, which makes it binding and real, or it's just noise people make before exercising force. You can't have both. Which is it, moral relativist who accepts enforcement as legitimate? Does legitimacy come from nowhere, or does shared agreement create actual obligations?

Laws enforce all sorts of things, not simply morals. My moral opinions matter to me and many other people. If we want a society, then we enlist rules and laws to give certain morals a backing, but that backing is neither a requirement nor the only way to make morals matter

Fine, but you've abandoned pure subjectivism. You just said moral opinions "matter" to people and create obligations strong enough to build societies around. Mattering to minds isn't the same as being mere opinion. A preference for ice cream flavors doesn't motivate collective action or bind strangers into shared systems. Your morals do. That binding force, that capacity to obligate across difference, suggests something deeper than opinion operating. You're describing morality as functionally objective within human communities, even if not metaphysically objective. So admit it: morality isn't subjective opinion, it's intersubjective reality. The question isn't whether it's objective anymore, it's what grounds that intersubjective force. What is it?