Coupla things here …
first, destroying federal property valued at $100,000 is a felony.
second, there are sentencing enhancements for committing a felony while in the possession of a firearm.
third, it’s at least three months before cows can use the newly-broken fence.
Bottom lines: once (if) these assholes leave the refuge, they have provided easily-documented, extensive evidence that they have committed a felony while in possession of a firearm. The old adage about “give 'em enough rope” seems to apply here. The tricky part will be arresting them, but it’s likely to be easier at an auto dealership in Tucson than at the Refuge.
And, once the Refuge managers are back in charge of the land, if, indeed, it was one of the local ranchers who asked the fence to be cut so his/her cows could go on there, the Refuge and BLM have a number of enforcement mechanisms to make sure that not only does that rancher not get cows onto the Refuge, but also that they are denied grazing privileges on other federal lands.
I’m not that impatient about the lack of “high profile” federal response here. Let these morons build the case to put them in jail for a decade, and then find ways to arrest them after they have gotten tired of life without Slim Jims and energy drinks. And punish the local ranchers who tried to get in bed with them by cutting off their grazing privileges. It’s not as neat and tidy as a drone attack (and believe me I have had revenge fantasies about a drone attack), but it may end up being more effective.