My take in two words: Moral Development.
If we had been a society of moral absolutes from 100,000 years ago until now we would still be living in a primitive tribal like culture. But, since we have allowed our morals to adapt and change by dissecting certain thought processes we have come to ascertain that certain ideas are better than others. Slavery is one of them.
If we had been a society of moral absolutes from 100,000 years ago until now we would still be living in a primitive tribal like culture. But, since we have allowed our morals to adapt and change by dissecting certain thought processes we have come to ascertain that certain ideas are better than others. Slavery is one of them.