I spoke with a guy recently about all this. We're both long time shooters and have had all too many, similar experiences at shooting ranges. One suggestion that came up was that no one gets a key to the range without going through an orientation, to see that they're handling guns safely, aren't abusing any range equipment, etc. When I was president of a local gun club, we had everyone sign a rule sheet. Of course it's one thing to sign a piece of paper, and quite another to actually behave yourself. If the range is out in the county, as ours was, then people can, and do, just walk around the gate, go in and wreak havoc.
The other, massive and very common problem, is people leaving junk at a range, whether it be a formal range or any place in the county that happens to be a decent place to shoot. All the best places to shoot in my general area have been shut down for that reason. I hate to say it; too many shooters are lousy rotten stinking pigs. Don’t be that guy. I always took all my trash and junk out when I left, and some more besides, but that didn’t prevent the nice places from being posted “No Trespassing”. There was still a “critical mass” of stupidity. Don’t get me wrong; I like blowing up used appliances as much as anyone, the difference being that I’d cart the junk and litter out with me, and pay the fee to take it to the dump.
I can’t help wondering how much of that abuse is intentional, perpetrated by someone who hates gun owners. Doesn’t matter though; if all the real shooters were careful to leave the place clean when they left, a few saboteurs would be unable to get the place shut down.