One of the indoor clubs I was a member at locally had a problem mentioned above - no on duty range officer. They tried to monitor behavior via CCTV, but there was so much unsafe behavior, I let my membership lapse and joined a new club across town that DOES have a range safety officer on duty full time. I feel much better knowing someone is keeping an eye on those who haven't learned the rules, and will remove those who don't think the rules apply to them.
For many years, I've belonged to a rifle club in southern Pennsylvania, about 40 minutes from my home. There is no range officer, but membership is by referral only and limited in number, guest regulations are strict, and the rules are clear. We have never had a major problem there, just a few minor ones on rare occasion (members not picking up brass, or displaying their club ID as required, etc.).