I'm tempted to side with the Native argument on this one because it's only fair they get to stipulate what gets put on their sacred land after centuries of collective ass-loving by our government. Unfortunately, if they're already building stuff, it sounds like they aren't going to be willing to uproot their entire project to put it on some other mountain. Sounds like it's too late.
Also, I'm strongly of the opinion that anonymous is not a real organization. If even a few internet neckbeards hop onto a cause under the moniker of 'anonymous', local news stations will pick it up for publicity reasons.