"Unlike other kinds of beliefs, our moral beliefs being right or wrong has no practical consequences." — Michael
Yes, I assumed you were saying that, but can you provide an argument for it? It seems rather unlikely. We agree that our moral beliefs have real consequences individually and socially I assume, and it seems likely that having false moral beliefs would be at least limiting and possibly deleterious or even fatal consequences. For example if we all believe it is wrong to kill babies, but we are wrong about that, then there will be more living babies than there ought to be, and hence population overshoot environmental catastrophe, and eventual population crash. All, very practical consequences. On the other hand, it might be that it is wrong to kill babies, but also wrong to be making so many babies. Life is complicated...
Moral beliefs seem to guide our social behaviour, and the factual content of those shared beliefs are the practical consequences in terms of the flourishing of life; particularly our species and its environment. If we were to discover life on another planet, we would have to become less parochial about it, but I stick to planet A for simplicity.
You could have it that rule-based morality represents wisdom about what worked best for our forebears. Since cultures evolve, what works changes over time. In one era, greed is destructive, in another, it's constructive. In this way, you could have a kind of moral realism, it's just that the rules are in flux. The basis for the rules is always the same, though: cultural evolution. — frank
In this case, the basis itself might change; if cultural evolution was the basis for most of history, there comes a modern time when it is no longer wise to ignore the environmental consequences of 'cultural evolution'. Again, it is a practical matter, and something that has only recently become a dominant moral issue. Anyway, the correct morals are the ones that lead to flourishing, aka 'the good'.
There was a science fiction story - forget whose but I think by a woman writer, about an intelligent species that procreated by a mass spawning in the sea. The juveniles spent their time in the sea and were prey to all sorts including adults of their own species those few that survived to emerge onto land as adults were only then considered to be moral subjects, rather as we (or some of us) treat birth as the beginning of moral subject-hood, or for others it is conception, or implantation, or rarely "every sperm is sacred." The Romans considered children to be property, I believe, and thus killing children was a personal matter, or killing other folks children a matter of infringement of parental rights. (I might be making that up, but it's a possible moral position. The Spartans had some fairly harsh ideas anyway.
Anyway, human cultures have moral beliefs that modify the culture in many ways, and not least in the effect on the psyche. Shaker beliefs, for example were that to procreate at all was wrong, which meant that without a plentiful supply of sinners, they could not survive. And they didn't. I am getting a bit Dawkins here for my own taste, but anti-natalism generally does undeniably suffer from short-term-ism unless its failure is guaranteed. A society that relies on immorality to survive is arguably merely indulging in double-think, a very common human trait, aka hypocrisy, that enables immoral moralities to survive at the cost of psychological misery.