I agree with what was a loaded gun doing in the display case. Was it a trade-in? In which case the store should have taken the weapon down to check for wear and functionality and cleaned. Someone at the store dropped the ball on this weapon.
On the other hand the LEO should at the very least checked the chamber with the weapon pointed in a safe direction. However my experience with LEO’s at the range is when they show up I leave. Most unsafe group I have ever been around
I was shocked - learned a valuable lesson