  Realists tend to agree with antirealists that radical moral disagreements are the most troublesome (see, e.g., Parfit 2011, 546), but they question the grounds for postulating such disagreements. They might in that context use several complementary strategies. One, which may be especially applicable to intercultural differences, is to argue that some disagreements are in fact merely apparent. Thus, polygamy is judged acceptable in some societies but deemed unacceptable in others. If each of those judgments contains an implicit indexical element, given which it holds only for the society in which it is held, then they are not incompatible. Indeed, if the conditions that obtain in those societies are different, then the situation is consistent with assuming that certain more basic principles are accepted in all societies, from which the differing views about polygamy could be derived. (This possibility is noted by John Mackie, who however downplays its importance, see 1977, 37.)