I'm not interested in dialogue with physical anti-realists. Certain mutual assumptions are necessary to hold a meaningful conversation, and some kind of physical realism is one of them. Another example is the Past Hypothesis: we must assume the past had lower entropy, otherwise we would believe that we are Boltzmann brains and be unable to trust our memories or senses. A third example is induction: believing the universe is more likely to be lawful than not, that our past experience is at least in principle a guide to the future.

If moral realists are on th... (read more)