Yes, the Yellowstone news is very disheartening. It sounds like in the vicinity of Rexburg there were several like-minded "preppers" who were perhaps just anti-government enough to assist them.
I hate to even type it out, but a quick family trip to Yellowstone feels like an attempt to appease Tylee (look at the new places we can see here!) in the midst of all this upheaval and then silence her complaints
Has anyone on here been to Cave Falls in the far SW corner of Yellowstone - the road stays open (typically) until Sept 30th and is not that far to Rexburg. It is very remote, but there is a campground and ranger station. From tripadvisor, folks who visited in September report that they were the only ones there.