Yoga pedagogy and ethics

I wonder if it's ethical to teach yoga instructors the assumption that chakras have an independent ontological reality of their own (ie they are real), when the original texts never make this assertion...they were to be imagined as an aid to meditation. the historical-textual development is testament in itself, as it took a few centuries for the 6-chakra-system to be standardised between the 6-9th centuries. Before this, and after, there were many ideas about, not only the number, but also the locations that chakras should be imagined at. Also, even after all this time, there is no empirical evidence that chakras are real. A feeling in the body is not proof. Neither is an appeal to emotion. Saying that some feeling is due to a blocked chakra is merely an opinion interpolated onto a fact, ie a physiological response. As an anthropologist, I am fascinated by this phenomenon of the assumption, and need, for chakras to be real. In a way, it reminds me of the similar ways in which creationists want intelligent design to be taught in science classes as a supposedly legitimate alternative.