And that's my very point - the fact that two people agree that THERE IS SUCH A THING as goodness is far more relevant than quibbles over whether or not some given action is good.

Also, using physical analogies to describe experiential realities is like using a piano arrangement to analyze a symphony written for a full orchestra. Every human knows that the experience of being alive is far richer and more significant than can be simply described. To describe a life fully is to live it out. To reduce human relationships and joy and suffering to nothing more than the interplay of chemicals and electricity inside a fatty lump of meat may be factual, in the sense that it is all that can be externally verified (and indeed might "truly" be all that there is) but nobody actually lives that way. We live as though there is some quality of reality in our own experience. It MATTERS when someone is in pain.

Logical positivism proposes a world where none of that is actually true, so whether or not it's the most truthful account of the universe, I'm going to keep living in the universe where I can believe that it's actually ontologically better to feed someone, rather than merely being a societally approved action.