We need to know how we thought of moral ideas, like good and bad. If we just made it up, then we should be moral antirealists. If we discovered that things can really be good or bad, then we should be moral realists.
If you think electrons are real, then you are a scientific realist. Entities theorized about science can be real despite the fact that we can’t experience the entities with our five senses. There are very plausible philosophical arguments that we should be scientific realists. Richard Boyd argues that in order to understand a plausible account of moral realism, we should understand a plausible account of scientific realism. (more…)