Really I am not a conspiracy theorists. But I tend to think that part of DAPL is within a plan to set precedence of using "energy independence" as like an Immanent domain concept on Native American lands. It is just that the individual projects from Standing Rock to Winslow Ariz. Make very little sense in cost benefit analysis. So these energy companies do not just throw their money away like government agencies - they want profit. I am not saying it is malicious but rather more sinister than that.
If this sounds far-fetched then you have not studied the economic reasons for genocide and culture annihilation of the Native Americans. Out West 90% of Native and European peoples got along just fine. The orders came from DC where railroad, mining interests and the privatization of lands (settlers) was determined to be a higher priority than peaceful coexistence. And do not think for one second that Christianity was an evil force also.
So back then it was those interests. Then it was water. Now it is energy. I call BS.