DISAGREE. Just following orders wasn't a valid defense for soldiers in wartime where the penalty for not following them could be death. Here if the brown shirt rangers don't follow orders they would get a reprimand or at worst lose their jobs. A JOB BTW that is paid for by the very taxpayers that they're turning away.
Park Rangers in their proper uniforms
The ones in Yellowstone Park at least seem to be relishing their assigned role of being nasty to the tourists.
As far as the Park service is concerned, we need to respond to them with MASS civil disobedience -- make it more unpleasant for them to buck us than to buck their evil 'superiors'.