Same here, in the area around Ridgecrest CA, I knew a guy who'd let me and some friends go out and shoot. Other "folks" got wind of it apparently and proceded to trash the place with old microwaves, washers, crap like that. Hell, I think they were emptying beer bottles and then shooting them...... at the same damned time.
So, it got posted "No shooting" simply because the owner of the land couldn't afford to keep cleaning all that *expletive deleted*it up.