People in spiritual need are mostly at all no abusers.
I have to disagree with you here. I'd say that those in severe need are sometimes too desperate to understand what they are doing. If their only experience of "culture" is Western consumerism, they just don't have the context to understand traditional cultures. It takes work to change that conditioning. Some people can change, and come to a place of understanding, but others never will.
Those in the most need are usually that way because they were raised without a sense of culture, and due to this they feel rootless. Rootless people can sometimes be helped, but other times they are just dangerous as they try to impose their values on others. This is why we see these people trying to buy and sell ceremonies and teachings.
I think if people truly learn to appreciate a culture on that culture's terms, to love and respect the ways and values of the people of that culture, they will understand that violating the standards set by the traditionals and elders of that culture is not a loving, humane, or earth-honoring thing to do. The loving, appreciative, and spiritual thing to do is to listen to the traditional people of that culture, and respect their views. The values of the people can not be separated from other aspects of the culture, but I feel this is what outsiders who want to use the ceremonies are doing. In their desperation to find a sense of peace and meaning in their lives, or their craving to have visions that will make them feel powerful and special, outsiders wind up actually dishonoring the people who have created, and now maintain, that culture and the ceremonies that are part of that culture.
If people can have a sense of pride in where they come from, and pretty much all cultures have earth-honoring aspects if you look deep enough, or back far enough, they won't need to rip off the traditions of other peoples.
Helping people feel rooted in who they really are, in where they come from, in what their ancestors believed, helps us all in the long run. Some of us are lucky to still have traditional people of our culture to listen to, while others of us have to look more to the past. But either way, I agree that this work of cultural preservation comes from a place of love and respect. If people seem "hateful" towards the exploiters, I would suggest that it is rather righteous anger at seeing their cultures, their people and their deeply-held values being disrespected by outsiders. Well-meaning outsiders, yes, often they are, but ignorant outsiders nonetheless. This is especially painful when those outsiders then pretend to somehow be a part of their culture or, even worse, somehow a representative of it.
There is much of important and healthy spiritual cultural change and interaction going on and that shoulc be couraged.
I'm not sure which changes these are. If actual Indigenous voices are being listened to, yeah, that's great. But many of these outsiders are so desperate that they'll listen to any imposter, or to anyone who has some Indigenous ancestry but isn't actually an authorized representative of that culture. In this way, misinformation and romanticized fantasies are spread, and cultural degradation results. These outcomes are not worth it just to make some rootless white people feel better about themselves.
I feel that same Great Spirit is present all around the Earth. Maybe there is just lot of tribes of Earth people some of them with rich of tradition and knowledge and some of them learning and seeking their own spiritual roots.
Well, as long as it really is their own roots they're seeking. The thing is, in the name of Universalism, we've seen a lot of people try to paste terms from a European culture over ceremonies from Native American cultures, claiming, "it's all the same Great Spirit." Theological discussions aside, there are real cultural and religious differences. People need to be coming from the place of feeling grounded in their particular culture, imho, before they can deal with other cultures respectfully.
If they are trying to rediscover their own roots, they need to approach their specific culture on its own terms, as well, and let their findings grow from that cultural matrix. If they approach a culture with expectations that it will have the same sorts of ceremonies, theology and structures as an unrelated culture they wish it to resemble, they will never find those roots, but rather only their projections.