Ranger hassled me in Yosemite this summer. I'm just lying there, drowsily wishing the world well, hanging out in the open with my HH 2" tree huggers attached to a couple of scrubby pines. Nothing weighty - just me in an AMK SOL Escape bivy on an ENOSN.
That ranger marched up in the dark and declared that I was "destroying his trees", along with other nonsense. At midnight and in the middle of a nylon shantytown filled with snotty german tourists and noisy, disposable-diaper-clad, bacon eating mass consumers!
I just blinked back at him. I didn't want to add any ammo to his anti-hammocker ideas and thereby hurt the whole hangin community. But he could easily have had himself some impromptu astronaut training. Getting away from silly conflict is why I get out of the City.
Next day I checked in at the ranger station and asked if they had any guidelines about hammocking - nothing specific about swinging, they said, they merely protect the park, including the trees.
Oh well, maybe a brown bear will get him.