Best analysis I've seen so far for what should be blindingly evident.
Under the Taylor Grazing Act, a permit system was set up that granted grazing privileges, not rights. The grazing permit is a revocable license under the law, not creating any right, title, interest, or estate in or to the land. In the early 1990s the BLM revised Mr. Bundy’s, and other ranchers’, permits to protect the desert tortoise. Mr. Bundy did not like the revision and so he made, in my opinion, a catastrophic, knee-jerk mistake when he stopped paying his grazing fees in defiance. It was catastrophic because what he did the moment he stopped paying was remove all legal standing he had. He relinquished any claim he had to graze on public land. When he did that, the BLM rightfully canceled his permit and would not grant him anymore permits.