Worst thing about public ranges.... - they're open to the general public.
I'm an Instructor and RSO. At one time I worked a p/t retirement gig at a LGS/Indoor Range. There was no dedicated RSO, just employees that could occasionally monitor the range through the Lexan window facing the range, as time would allow.
The stuff we saw there was often very concerning. Muzzle-sweeps of everyone there, removing and omitting the mandatory eye protection, shooters placing rounds in their magazines backwards and asking for help for their pistol that for some reason is malfunctioning (and angry because they bought it there), a lady who brought her .32 DA revolver there along with a small hammer. The hammer was used to pound the rounds into the never-cleaned chambers, and pound the ejector rod to clear empty brass. Tried explaining to her why that might be a bad idea, and to purchase one of our cleaning kits. 'No, can't afford it'.
People/shooters who objected to the $1 per target (a variety of large targets ranging from silhouette to several bullseye graphics) and decided to just shoot the plastic target HANGERS equipped with clamps for holding the target.
I could go on with many more incredible examples of stupidity. When we would enter the range to make these shooters aware of their infraction(s), reactions ranged from a somber apology and Thank you to anger and rage and storming out, vowing to never come again.
So, long ago made up my mind that if my ONLY access to shooting was a public indoor range (such as many of our customers), I'd rather switch to golf, carving animals, fish more than I do, fly tying, etc. Got where I hated that environment, and having a touch of claustrophobia doesn't help either.