It's not about rights. It's about respect. A minute ago you thought it was about expertise; now you think it's about rights.Then it is even more bogus. It was already pointed out, no one owns a culture and thus no one has more rights than others to use said culture in works of fiction.
You clearly don't understand the concept, or what 'cultural appropriation' means, so why are you railing against it and hijacking a perfectly decent thread about a new setting? I mean, it's hard take your words seriously when you don't understand what the subject matter is.