No, this is NOT about what you thought.
It’s about SAFETY.
Most of the gun-friendly venues I’ve visited in recent years require clearing of weapons before entrance. Most gun shops, for example. Some even have a ballistic barrel bunker filled will sand to accomplish this. ‘For safety‘. Some gun shows even require nylon zip ties post clearance, if one intends to bring the firearm into the show!
I remember a time. (cocks head sideways, looks skyward, pensively) when all that was required in most gun shows and shops was don’t touch it.
The Duck reminded me of this, with an attached video showing a young man very proud of his new Ithaca Model 37. He cannot stop fondling it. (Freudian gun equivalency jokes here)
You can guess what happens next. At about 2:50 in.
Booger hooks, bang switch. Period. If you must dry-practice, remove all ammo to another room, first.
Addendum – word around the innerwebs is this was a put-up job, likely a blank shotgun shell used to create a large audience of suckers. Regardless, blanks or live rounds, the same principles apply.
See Rule #3 on the sidebar!