So would you say slavery in 1800's Southern U.S. was acceptable since that was the cultural norm? If you were a slave in that situation would you simply shrug your shoulders and get to tillin' them fields out of respect for their culture?
It is acceptable for a society to establish its own rules and regulations, regardless of what they may be because a society consists of free individuals who can do whatever they choose. Whether or not I agree with your behavior does not make you any more or less able to perform the behavior I disagree with. Whether or not your behavior is moral is a matter of who you ask. If I disagree enough, then I will do what I can to stop you. If I don't do what I can to stop you, then I obviously don't disagree with your behavior as much as I might claim to.
For those who are in that society they either agree with the rules or they don't, if they do then they obey if they don't then they revolt.
A person's failure to revolt against a society he or she sees as corrupt is a sign of agreement, or at least comfort with the social standards established by the society.
A society is nothing more than a structure established by a group of free individuals seeking to expand protect their freedom. And any society can rule as it pleases regarding any situation. Whether or not I agree does not have anything to do with the society's ability to make it's own rules.
If I really disagree, then I will intervene by whatever means I feel necessary. Otherwise I don't really disagree.
Many attempt to resolve conflict with less than desirable theories of morality. I, on the other hand, see conflict as an inevitable part of interaction between totally free beings with competing or contradictory values.
And so, following this line of reasoning, if the society you live in says that it is ok to murder innocent humans(women, children, old folks) then it is ok to do so? Sounds like a completely morally bankrupt society to me! If your religious leader were to tell you today that your god commanded you to perform such horrendous acts, would you do as you were commanded?
See the above.