There have been times when it seems like I'm surrounded by newbies renting pistols just for fun. Got good RSOs at the range I frequent, but they can't possibly catch every last mess up. They do pay pretty good attention to anyone who seems to be inexperienced, watch them. Sometimes they actually come out of the booth correct mistakes.
The first time I went to the range, I didn't know what I was doing, but I sure knew to keep the gun pointed downrange. RSO came out and corrected my grip.
There are usually quite a few regulars around when I'm there. Most of them are pretty good about helping out any newbies.
I keep my SA on high alert at the range (and in the parking lot). I also try to not let other people get me too upset. If others are being really unsafe, I find an RSO immediately.