If morality is the result of biological evolution, does that mean it is not "real"?

If morality is the result of biological evolution, does that mean it is not "real"?

This is one of the deepest questions in contemporary moral philosophy. Discoveries in evolutionary biology have shown that many of our moral behaviors (such as cooperation, altruism, justice) have evolutionary roots. Some people see this as "explaining away" morality, i.e., making it merely an illusion or biological trick. Others see that evolutionary origin does not negate the reality or objectivity of morality. This debate touches the core of what we mean by "truth" in the moral domain.

Inadequate Responses to Avoid

From some believers:

"Evolution is a false theory, so no need to worry." This is avoiding the question. Even if we reject biological evolution, the philosophical question remains: can morality be real if it has a natural origin? Escaping the question doesn't solve it.

"Morality is from God, and science cannot explain it." This confuses levels of explanation. Science may explain how our capacity for moral perception arose, without necessarily negating the existence of objective moral truths. Scientific explanation and metaphysical foundation are different levels.

From some atheists:

"Evolution proves that morality is merely a useful illusion." A logical leap. That something has an evolutionary origin doesn't mean it's an "illusion." Our capacity for mathematics has an evolutionary origin; does this mean 2+2=4 is an illusion? Confusing the origin of capacity with the truth of content is a common philosophical error.

"Morality is just brain chemistry." Hasty reductionism. Even if morality has a neural and chemical basis, this doesn't negate its meaning or value. Love has a chemical basis; does this mean it's "merely" chemistry? Material reductionism ignores different levels of meaning.

Why These Responses Are Inadequate

They all confuse "causal explanation" (how did morality arise?) with "normative justification" (why should we be moral?). Knowing the origin of something doesn't necessarily determine its value or truth. This is what philosophers call the "genetic fallacy."

Serious Positions in the Debate

First, strong moral realism. Philosophers like Derek Parfit and Michael Huemer see moral truths as existing independently, like mathematical truths. Even if our capacity to perceive them evolved, this doesn't negate their existence. Just as the evolution of our capacity to perceive shapes doesn't negate the existence of geometric forms.

Second, moral compatibilism. Philosophers like Sharon Street and Richard Joyce propose that morality can be "real" in a practical sense even if not metaphysically absolute. Morality is real because it serves a vital social and psychological function, and this is sufficient to consider it "real" in the sense that matters.

Third, error theory. Philosophers like J.L. Mackie accept that evolution undermines objective morality. They see our moral judgments as systematically false because they presuppose non-existent objectivity. But they see this as not meaning we should abandon morality practically.

Fourth, the sophisticated religious position. Many contemporary religious philosophers (like Alvin Plantinga and Richard Swinburne) accept evolution but see God as having directed the evolutionary process to produce beings capable of perceiving objective moral truths. Evolution is a mechanism, not a negation of purpose.

Where We Stand in This Debate Today

The debate remains open and vibrant. Most philosophers specializing in ethics (about 56% according to the PhilPapers survey) lean toward some form of moral realism, i.e., they see objective moral truths existing in some sense. The evolutionary origin of morality is not considered a decisive negation of its reality by most specialists.

What's important is distinguishing between different levels of "reality." Morality may not be "real" in the same way rocks are real, but this doesn't mean it's an "illusion." Perhaps it's real the way numbers, meanings, or aesthetic values are real - i.e., real in a different way from material things.

For Advanced Reading

- Intermediate level: "Evolutionary Debunking Problem" by Sharon Street
- Advanced level: Parfit's discussion in "On What Matters" on non-naturalistic moral realism
- "Moral Argument" family page on the site
- "Evolution and Ethics" page in Stanford Encyclopedia of Philosophy