Not sure why people are so meek but my answer would be “Make me.”
I work with relocating & transitioning people just like this couple (downsizing & packing up households, moving them into assisted living, retirement communities or smaller homes). They are not "meek" so much as they can be confused and overly trusting.
Some elderly people are easily disoriented by too much information being thrust at them, and hearing loss and/or beginning dementia can be huge factors. I see how the trauma & upset of a simple relocation, even within the same campus, can afflict a person in their later years. What is being done to these people is absolutely despicable!
I'd bet a month's salary that this story won't see the light of "lamestream news" any day soon. Makes me want to spit!
Before I got even that far, I'd demand (with cameras running) that the NPS provided the written order for the action. Also the law or regulation of some privilege or service they have always been able to provide me for having my house (with paperwork) on "their" dirt that they cannot do during this "shutdown".
Then bring out your copy of the deed, and start going through it, and ask the federal punk if any section rings a bell in his limited memory.
Exactly, who lets a park ranger through you out of your home? Sit tight, and record it all on video