Who cares?  It's not like "stealing" culture deprives others of it.  "Culture" is greatly overvalued, and is usually based on long-outdated beliefs, concepts and prejudices (e.g. clitoral mutilation).  Moreover, it is often counterproductive and destructive, and lends itself to the "us v. them" attitudes that result in conflict and racial superiority.  Once we get to the point where one must be officially certified as part of a culture to be able to express a view about an aspect of that culture, we enter the region of the absurd.  What percentage ancestry do I have to have to be allowed to express a view?  Can I not write a book about seals unless I am Inuit?  Can I not write a book on the history of Great Britain if I don't have British ancestors?  Can I not speak out about cultures that oppress women unless I am of that culture?  Real culture is how people live and is subject to constant change, not the remnants of the practices of outdated and irrelevant civilizations.