Grazing rights and permits don't appear to be an issue in this case. Setting a grass fire is.
There has obviously been a great deal of friction for awhile in this case; there is no reporting about that - but some of us can figure out some of the reasons.
There doesn't seem to have been an friction at all until the Bundy's and their crew showed up. The Hamiltons don't want them there. The town people don't want them there. The Sheriff doesn't want them there. But yet they came.
The feds planted sent an informant onto their place - clear evidence of previous friction between the two parties.