this seems to have been popping up a lot lately and its really been bugging me. to me white people have culture. we all have come from different places and we all connect to our roots in different ways. jsut because some one is white, doesn't mean that they are racist, jsut because they write a story with no minority groups doesn't mean that they are racist. if it doesn't make sense to put a person in a story they don't fit into, then good authors usually don't. it wouldn't make sense to force characters someplace where they don't fit.
i like what people wiser than i have said about the subject, i'm just pointing out my opinion on the matter.