What does Midgley mean by "moral isolationism"? Do you agree with her that it "makes no sense at all"? Why or why not?

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The Answer is By moral isolationism, Midgley means the notion that only members of a particular culture are qualified to make judgments about the morality of that culture. For instance, a Westerner would not be able to asses the morality of a practice of an indigenous tribe of Paupa New Guinea, because the Westerner does not understand that culture, morality, history, etc.
If understood weakly, this moral isolationism makes some sense. It is much more difficult for someone to make judgments about which they know or understand little, verses something which they understand well. Thus a person intimately acquainted with Western morality and not at all with that of the indigenous tribe in question is unlikely to make a valid sort of judgment about the tribe.
However, Midgley is attacking the stronger form of moral isolationism, that is, that people are only qualified to make judgments about only their own morality, and it is impossible to learn anything about another morality, to understand it in a significant sense, and therefore judgment about it is impossible. We are stuck in our own morality and we cannot get out. This is the claim that Midgley thinks makes no sense. We are clearly not isolated in this way. Anthropologists routinely learn and come to understand cultures and moral notions of other cultures. Our culture is itself nothing but a mix of other cultures.
Midgley seems to accept the weak form, that it is difficult, but by no means impossible to understand and make judgments about other cultures. It is simply an empirical fact that we do learn more and more about other cultures and moral systems every day. Midgley rejects the further strong form which claims that it is impossible to make judgments of other cultures.

What Does Midgley Mean by "Moral Isolationism"? Do You Agree