May be wrong, but here's a thought.

 
Hitler took great care to pamper and coddle his people 
and they loved him -- and the Nazi regime -- for it. - 

 http://thepeoplescube.com/peoples-blog/hitler-feel-good-fuehrer-with-focus-on-social-benefits-t11523.html#sthash.UoGlEEGj.dpuf

Well, I was a law officer for 30+ years, and during that time, I earned a degree in Criminal Justice Administration and completed two years of Law School. 

Here is my thought:

All the National Parks are National because they are Public Property. So far, I have been to Yosemite, King's Canyon, the Grand Canyon, Zion, The Arches, and assorted other smaller parks. 

I never saw a "No Trespassing" sign posted. They charged me admission--until I turned 65, then I got a "Forever Pass". 

My thought: Next time a Park Ranger tries to stop and cite--especially on the Mall, where no admission is charged, I suggest getting his name and station address. Then, sue for False Arrest.

I'm sure they are going to come back with " I was acting under orders". 

That worked out real well at Nuremberg