Really? I mean, sorry for blathering, but I find this extremely surprising. I always considered it a simple fact that if you don’t have some kind of religious/faith-based metaphysics operating, you can’t be a moral realist. What experiment could you possibly perform
That would be epistemology...
to test moral-realist hypotheses, particularly when dealing with nonhumans? It simply doesn’t make any sense.
There are rationally acceptable subjects that don’t use empiricism, such as maths, and there are subjects such as economics which have a mixed epistemology.
However, if this epistemological-sounding complaint is actually about metaphysics, ie “what experiment could you perform to detect a non-natural moral property”, the answer is that moral realists have to suppose the existence of special psychological faculty.
That would be epistemology...
There are rationally acceptable subjects that don’t use empiricism, such as maths, and there are subjects such as economics which have a mixed epistemology.
However, if this epistemological-sounding complaint is actually about metaphysics, ie “what experiment could you perform to detect a non-natural moral property”, the answer is that moral realists have to suppose the existence of special psychological faculty.