But sure, you tell yourself that they do to justify holding onto supernatural explaination despite the fact they have little corelation to reality.
Are you expecting that everyone looking at their fields come up with the whole backlog of western philosophy and science before you allow them to come up with conclusions that are in perfect alignment with their observations? Is it immoral to conclude "things fall down" without simultaneously explaining the movement of the planets?
Then, western science itself is not at all free from supernatural explanations: Because at the end of it, we don't know everything, either. The tribe has an understanding of ecological interrelationship, but preciously little about chemistry and none about quantum physics, while we have preciously little justifications for choices such as disliking Boltzmann brains: Yes, that is a supernatural belief. "The universe dreaming itself, that'd be silly".
So not just is your stance here hypocritical because science itself holds on to supernatural concepts at the edge of our understanding, it's also arrogant as that kind of attitude makes you prone to ignore perfectly correct insight just because it's expressed in a language you don't like.