Someone who can create tornados could raze wholetowns. That’s dangerous. And dangerous people need to becontrolled. And if they can’t be controlled, best they be put down.
I think this is a common theme surrounding native people, especially the unknown to what is the norm (by standards of the colonizer). That is why scientist conduct research on things that are sacred to us. Or how the US government has "Area 51". People are scared of the unknown and are most likely labeled dangerous by outsiders. But we know that our magic and our beliefs is what is really dangerous. And so colonizers try to control and put us down.