Moral Realism and the Evolution of Moral Beliefs

The speaker argues that the claim there's no causal efficacy to people's moral beliefs is false, citing historical examples of moral evolution such as the abolition of slavery. They assert that people changed their minds about moral beliefs because it's actually true that other people matter, which supports the idea of moral realism. The speaker emphasizes that comparing the world with slavery to the world without slavery cannot be objectively judged as better, as it's a matter of personal perspective. They suggest that it's a mistake to push things into the objective, and highlight the importance of living our lives subjectively while still evaluating and considering things to be better or worse.