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The skinwalkers are regarded as selfish, greedy, and untrustworthy,” Benyshek says. “If the Navajo knew someone to be a skinwalker, they would probably kill him, not ask for his help with the Utes. Besides, even if he was asked, the skinwalker would be unlikely to help the Navajo get revenge, since his motives are entirely evil and self-serving. From the Navajo perspective, this story doesn’t make sense.
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Colm A. Kelleher (Hunt for the Skinwalker: Science Confronts the Unexplained at a Remote Ranch in Utah)