Morality

[Whateverist]

"Similarly a perfect moral position in one society may not (probably won't) translate into the next."

You seem to be under the impression that people are just blank slates with nothing whatsoever intrinsically in common. Admittedly culture counts for a lot but consider the needs any culture must account for. We all eat the same range of foods, have young that need support for greatly protracted childhoods, have need of the same level of shelter within the same range of climates, have the same instinctive fears and probably have some amount of instinctual (or at least dispositional) tendency toward pro-social behavior toward kin and tribe. The morals which arise in a community of humans can not be random since they must answer to so many predictable requirements if the group is to be successful.