Now, it seems flat-out baffling that a bunch of ranchers would go bananas and take over a wildlife refuge just because two guys were found guilty of starting a series of uncontrolled fires on Federal land. (Even more confusing, the convicted men want fuck all to do with the militia who formed in their defense.) But when you think of the takeover as a tipping point, their motives becomes somewhat more cognizable.
In the same way that randomly coldclocking a co-worker makes sense after years of slow, soul-leeching microaggressions.
What's happening here is actually a long battle over farmland that's been repurposed as federally-managed space. Throughout the 20th century, the act of using government land for cattle grazing and farming became the bureaucratic equivalent of a Nickelodeon GUTS event -- complete with an ever-changing Aggro Crag of policies and restrictions. In short, Uncle Sam yoinked the land from under these ranchers' feet and made them tap dance to get it back.
See, the reason the Oregon militiamen feel ownership over this land is because it was first given to ranchers by the U.S. government back when we were still expanding into the totally up-for-grabs West. This absolutely uninhabited area was then distributed to farmers to drum up economic growth. Everybody was a winner! But by the end of the 1800s, the attention shifted and the land was taken back, which is what the Bundy family behind the Oregon standoff is still ultra-miffed about.