Bundy's family had grazed cattle there for three generations (theory of mixing one's labor with the land = ownership). They'd never paid the Fedgov for it. They DID pay the State of Nevada.
This involves a land-grab from a couple decades ago where Fed control of public land was dramatically expanded... it has long been a sore point among many.
Ok so he isn't poor... only poor people deserve compassion when the government sends in puppy-stomping jackboot thugs?