as owners of the land that the pipeline runs over, the government is naturally the institution demanding safety. What makes government "evil" is that it usually acquires property by force, gives it away to powerful special interests, and does a piss poor job managing and preserving it.
That is, if this land (and the Indian territory) actually was private property and managed as private property, then there would be nothing to riot and protest about.
Wait, is it evil to acquire property by force, or not? Because... how do you think the government got the land this nation is based upon?