“We can also set up a line of retreat for those afraid to allow a causal role for evolution, in their account of how morality came to be. (Note that this is extremely distinct from granting evolution a justificational status in moral theories.) Love has to come into existence somehow—for if we cannot take joy in things that can come into existence, our lives will be empty indeed. Evolution may not be a particularly pleasant way for love to evolve, but judge the end product—not the source. Otherwise you would be committing what is known (appropriately) as The Genetic Fallacy: causation is not the same concept as justification. It’s not like you can step outside the brain evolution gave you; rebelling against nature is only possible from within nature” (Eliezer Yudkowsky, Rationality)