I have seen, in my limited 10 or so times going to a public range, the following:
1 man who walked down a hot rifle range, to change targets. I saw him through the reticle of my scope, while my finger was on a 1.5 lb trigger. He walked ACROSS my field of fire.
I saw a guy touch off a Desert Eagle .50, through the roof of the Delaware range....twice. First time after clearing a jam, then again in frustration.....all in under a minute.
I saw a man turn and sweep the entire line with a hot Mini-14, finger on the trigger.
I saw a kid take a cosmoline-soaked, new out of the cardboard SKS, and proceed to fire it. Which, of course, the firing pin was locked tight and it went full-auto. He shot the last 5 shots way over the berm.
You want to know why they're so strict? Work a day there, observe how god damned stupid some of our fellow shooters really are, and you'll be amazed they even bother to keep the gate open.
Do yourself a favor. Join a private range, buy some land, or go to Millers. The public ranges are not for safe, responsible shooters. They're for once-a-year deer hunters and idiots who NEED supervision.