My position is quite simple: I do not believe it's possible to compare the righteousness of cultures, certainly not in a way as reductive as you've proposed, in a way that conveniently makes our culture (America) gooder and the others (Saudi Arabia) badder. Please re-read my original comment, I specifically proposed offering cultural asylum as a way to offer western moral values to others who want to live according to them. I am in favour of cultural evolution, I am in favour of taking action against our moral ills, I believe that in your hypothetical that I would have a moral duty to oppose and take action against slavery within my own culture.

My question to you is, do you believe the United Arab Emirates is more righteous than the United States? According to many measures of "goodness" like the Human Development Index (and the inequality-adjusted Human Development Index) the United Arab Emirates is a more "good" place than the United States and therefore, in your view of comparable righteousness, the United Arab Emirates is a more righteous place? Yet, the United Arab Emirates is, to many westerners (including myself and I am sure you) a place of many moral ills (including one of the most heinous: slavery). Do you believe that on your multi-dimensional most-good morality spectrum the United Arab Emirates out ranks the United States?

I'll answer that for you: no, you don't. And deep beneath this facade of objective morality, you know that morality is so deeply ingrained in your cultural upbringing that you cannot sincerely state that the United Arab Emirates is more righteous than the United States, and that regardless of what any measure, whether it's one dimension or many dimensional, whether it's black and white or a spectrum, regardless of what that measure says, nothing is above your sense of what is right and what is wrong.