> You haven't exactly defined what you mean by "biological reality".
> Resignation to intentions of nature, i.e., statements like these: ["]I am claiming that amorality is morality["] [i]s exactly what I consider naturalism.
I think we have an is-ought problem here.
I am describing what is. Biological reality is 'what is'. I am not describing what ought to be. What I am saying is that yes, morality is subjective, and people (inclusively, taking all peoples throughout history) very strongly disagree on what is moral and immoral.
> everyone agrees on the good or the bad side of it.
That's the thing. They don't, not even close.
> "fashionable social norms" are an approximation, that doesn't mean the thing they're trying to approximate doesn't exist. Just like physics don't cease to exist because our conclusions about it are not always correct.
Are you suggesting moral realism? That is, are you saying that there are, in fact, some kind of moral truths we can discover? How? Through experiment? Archaeology? Reason? I am guessing the latter; if I can be allowed to speculate as to your thought process, you seem to hold something like the Golden Rule as an axiom of moral truths. That is, murder is wrong because, as I do not want to be murdered, it would be wrong for me to murder someone.
But what I'm saying is there is no justification for that axiom (though I personally might prefer it). It's arbitrary. We can construct an elegant system of ethics upon it, but it would be founded in the sand. And thus we discover why, again, throughout human history, there were countless cultures who would have regarded it as the most silly nonsense they'd ever heard.
> I will say there is a big difference between a civilization where the bad is OK and one where it is not. I also know which one I'd prefer to live in. Which one pretty much everyone will prefer to live in.
Most people will prefer to live in the civilization most like their own. Naturally, you and I would most prefer to live in a modern Western society where everyone agrees with us on most points of right and wrong.
> Caring for the weak and our own is a thing social animals do? To a very, very limited point...
I think you would be surprised by animal behavior. They will risk their lives for others. A good example is elephants, who have been known to do everything they can for the injured, even if it's just wait in the same place for them to die, hold 'funerals', and even seek vengeance on those who hurt their fellow.
> At some point, we need to start distinguishing what evolution intended and what we do.
Evolution does not intend anything at all.
> we didn't do that at all for quite a few members of society for a very long time.
Plenty of other cultures did for long periods of history.