Cliven Bundy hadn't paid grazing fees for 20 years. That's separate from any talk about ecology.
Which underlines how unimportant the grazing fees were. No one cared, and no one really cared if he paid 20 years to get current. They wanted to restrict grazing rights from local ag, particularly Mr. Bundy because a tortoise was endangered or because BLM ecologists wanted the land to remain unmolested by humans and livestock.
Regardless, these kinds of conflicts are common, but most of them are never reported. How many people know that you couldn't even collect rainwater off of your own roof in Colorado until the liberalization laws in 2009?
Conflict with federal administrations and state agencies that accept federal money is just part of life in the West.