Greenpeace was engaged in racketeering, not protest.
What started as a beef between the Tribe and the pipeline company over (as I heard it) the tribe changing it's price for an easement (tripled it) and the pipeline company saying "For that much we can go around tribal lands and have change left over"--and then doing just that, leaving the tribe with no deal, no easement to lease, and no money, got to be national news when Greenpeace, et. al. got involved and tried to pressure everyone into revoking permits and shutting the pipeline down. At least half the oil that leaves the State goes out on that pipeline, and the rest, mostly by rail. At the time, it seemed the oil was at fault for railway accidents in Carrington, ND, Virginia, and IIRC, Washington State, which were brayed about in the headlines nationally.
Considering the State of ND extracts an 11.5% tax on every barrel of oil produced, anything that interferes with that costs everyone in the State in the form of lost tax revenue. For those of us in the upstream oil industry, the discounts on ND Sweet crude due to transport costs were affecting the drilling and production operations, too, as the ROI was suffering. All because a bunch of latter day hippies wanted to have a winter camp on a flood plain and protest.
All their misbehaviour cost the State, in not just lost revenue, but Law Enforcement costs, damage to roads and a highway bridge.
Three active pipelines were tampered with during the protests (Those idiots were caught and prosecuted; pipeline operators were paying attention and shut down operations before there was a catastrophe).
So, as far as I am concerned, any outfit backing those protests can pick up the tab.