If you are honest with yourself, I think you will realize that everyone on this planet is related if you go back far enough. We all share the same air, water, and earth, and we are all the same race. I think a lot of problems can arise from people trying to pretend they are different from the person in front of them. All of our DNA is almost exactly the same.
That said - I greatly enjoy experiencing unique cultures, and if a culture wants to protect itself and preserve itself in some way, I respect that and greatly appreciate it. However, I also find the anthropological attempt to preserve cultures that arent theirs to be demeaning and patronizing. The idea of the "noble savage" I find especially patronizing, as if Indians didnt sometimes destroy their own ecosystems or have incredibly horrible warfare, slavery, and human sacrifice sometimes. I think the "noble savage" is a good example of how we view other people as different then us, when they are really our brothers and sisters. As much as people might try, it is unreasonable to think that things will always stay how they are, or that human nature is going to suddenly change - for our entire history, we have fought for land and resources, we have learned from each other, and we have changed again and again.
Throughout history, all cultures have constantly learned from each other and adopted the customs or ideas, or technology of other cultures. This is a natural process, and we only hurt ourselves if we deny progress because another culture thought of it first. Ever eat potatoes? Well, you are appropriating Peruvian culture I guess, but who really cares? Potatoes are probably more associated with Irish people now, but fact is, they are recent to Europe, but people figured out how to make potatoes non-toxic in Peru thousands of years ago. When tomatoes came to Europe, people thought they were a deadly nightshade, until a famine in Italy led to people learning tomatoes are awesome - and now the Peruvians are culturally appropriating the Italians every time they eat a tomato! When will the appropriation end!
I'm Jewish, but my peoples culture comes from a mix of Egyptian influences, Canaanite influences, Vedic influences, Tibetan and Turkish influences, Greek and Roman influences - because it is impossible for a culture to not be effected by other cultures it contacts! All contact rubs off at least a little bit! So, even if I only stick to my "families heritage" (as opposed to the heritage of all human beings), I am really still stealing from many cultures I never had contact with (I have never been to Egypt or Greece or any of the other places that effected Jewish culture).
I do a lot of traveling lately, and most of it is in Peru with indigenous peoples. Mostly I work with Shipibo indians and Q'ero indians, as well as some mestizos (mixed decent). These natives draw from western culture as much as we draw from theirs. They wear mostly western clothing, they drive motorcycles, they drink soda if they can afford it, they eat rice from Asia and sell us their Quinoa. Some of them can afford ipods or TV's to watch soccer on. They also get some awesome stuff from us: like medicine, soap, and all the other important things most of us take for granted. Soap especially is incredibly important and helpful for people who havent had it before - it can save many many lives for them.
When I travel - the Q'ero and Shipibo love to share their culture with others. It is actually what keeps them alive and allows them to preserve some part of their culture. It does alter their culture in some ways, but why should the religions and practices of some people get to change while other people have to keep their exactly the same? Fact is, all cultures and practices evolve with time, and this doesnt mean they are getting "watered down." It means they are changing to fit the times and the people. So these natives will gladly teach me their practice, and it not only helps me greatly, but I always try to give back - not just in cash, but in other ways too (recently I helped install outdoor bathrooms at a Q'ero village that has never had any - they were extremely grateful, and this will probably save lives for them). But here at home, people may sometimes try to tell me it isnt okay for me to learn and practice these techniques the Q'ero freely taught me - they cant decide for themselves, because someone else knows whats best for them apparently.
Surprisingly, the local customs taught to me by the Q'ero are incredibly similar to how my Jewish family practiced their spirituality as well. Almost like seeing my families faith in the past. Both cultures worship God through nature, both revere mountain spirits above all, and both work with nature spirits. Both have many different classes of spirit they work with. Both use smudging, dreams, visions, fasting, sacred baths, calling in the directions, long prayers and conjurations, respect for the dead , offerings ect..... But even though my family used to do these things, I am misappropriating culture if I do them now, because my family does them less often or something? Doesnt make a lot of sense to me....
Really, overall, I greatly believe in respecting and preserving cultures that want to be preserved. When I travel, I try to participate in the local culture and not rub off to much if I can help it. At the same time, I know that it is only natural for people to learn from each other, and everyone is my brother and sister if we go far enough back, so I dont feel guilty when a native teaches me something, or if anyone else teaches me something for that matter! We shouldnt single people or groups out - if we treat each other as equals, I think we will get along better.