Let's step back and realize that there will always be moral obligations to a society for it's members.
Darkproton,
Could you expound on the statement above? I am curious as to your exact meaning. The way you've worded it leaves me with the following question: Exactly 'where' is the moral obligation placed?....if it's 'to' a society...and 'for' it's members.
FWIW - Society's with mixed philosophies will have mixed ethics...and therefore conflicts within questions of ethics.
I would but I feel my words may get twisted around. My arguments basically, at their core, arise from the value on all life. If there is an ethic/cultural belief that leads to suffering then it should be abandoned. Ex. slavery, foot binding, killing of widows, etc,. Cosmopolitanism. Also Kwame Anthony Appiah.