The federal government isn't grabbing land. The land was ceded to the US government in 1848, 18 years before Nevada even became a state. When US territories become states, federal lands remain federal lands. The state of Nevada officials know this, which is why there has never been a single instance of the state suing the federal government for control of the land.
They have tried for 20 years to be reasonable with this guy. He has no intention of being reasonable. In the 2012 court case, not only had he refused to comply with previous court orders, he has proceeded to trespass even further onto more federal land. Whether he likes it or not, we are a nation of laws. He has had several chances in court but failed to present any viable case. And his answer to not liking the landlord is to refuse to pay the rent, and gather a bunch of friends with guns to prevent the enforcement of legal court orders to evict him.