Conscience and the Moral Argument as Evidence for the Goodness of God.

[Belacqua]

every society has its morality, but each is different. What is deemed good in one society is often deemed bad in another; for instance, killing is immoral in most societies (under most but not all circumstances), but head-hunting is or was a valuable and appropriate behavior in some societies. In other words, morality is not absolute or universal, despite what you think, but relative.

If the majority of people in a society think slavery is OK, then is slavery moral in that time and place? 

Or is slavery always wrong, in your view?