Among the Indian nations many spiritual leaders took a very active role in trying to preserve their people and their way of life. Crazy Horse is a good example. Among contemporary native American people Western Shoshone elder Corbin Harney is an eloquent but by no means isolated example. Apparently because they did not successfully resist the white man and the white man's diseases, they are useless. Here we have dualism at its most extreme.
Rituals are either all powerful, or they are useless.
This is silly. There was once a time when I thought these things were as McClellan says. One teacher of mine asked the powers to provide me with an attitude adjustment when I went away on a vision quest. I hope John McClellan will be similarly blessed. McClellan's basic argument is ferociously dualist.