Was it because there were too few senior Trump Administration officials in place to catch and stop it? Or because Department of the Interior Secretary Ryan Zinke was new on the job, and had so much on his plate, that this decision just slipped right past him?
Maybe it was because the new Administration faces so many battles with environmental activists already that it didn't want another one? Or perhaps Interior was intimidated by environmentalist lawsuits challenging President Trump's 60-day delay of newly-issued Obama Administration regulations?