Let me a take a different tack here.
It seems to me an assumption in your position, Mo, is that, really, with some quantitative variation, we are all the same. Culture and ignorance can make it seem like we are vastly more different than each other, but at root we really want the same things, and thus we can come up with a morality based on pain and other measurable neurological reactions, a morality that works for everyone, in fact, even if their culture and ignorace of cause and effect, make it hard for them to realize.
I used to think something like this. In any case that we are all, really, pretty much the same.
It doesn’t really fit my experience.
There seem to be a lot of people who like to be under authority. Who may like the idea of freedom in the abstract, but seek to place themselves under authority as much as possible and do seem happier there than I ever would. They made the transition from royalty based governments to republics and democracies without really granting themselves or seeming to be very attracted to utilizing freedoms I like to and would like to. They conform because it is normal. And they dislike the not normal because it is not normal. They may at times weigh in with arguments about why normal is better, but often, in fact, they can come right out and say the issue is simply that being normal is good, period.
I can think, oh, I know how they really would like to live. If I could teach them critical thinking, and perhaps undo some of the judgments and fear that lock them into these places. If they could be encouraged to experience freedom, creativity, individuality - rather than thinking that Nike and Chanel will give them individuality - they would realize they are like me, not in specifics, but in the general urges.
How…presumptuous.
What if there are people who simply do not thrive in the same ways? They are not really at root like you, Mo. It seems clear to me that some people actually want there to be strife, war, conflict, dog eat god environments, harsh interpersonal dynamics. (this is not necessarily at all the same group as the conformists I mentioned above) It is not an us them, I see a number of groups out there.
I spent a long time thinking, really, they differed with me over what was a necessary evil. Or they did not know there might be ways to mitigate some of this. Or that their upbringing distorted their real selves.
I don’t buy that at all, now.
It seems to me your sense of morality is based on this general unity of humankind. (if that does not seem like the case to you, then we need to focus there and perhaps I am wrong about this implication)