Everybody is stupid some of the time, but some people are stupid all of the time. The latter group shouldn't be allowed near deadly weapons.
My ex-wife's second cousin was in that group. He was a gun owner who should have known how to be safe around firearms. One day I was was unlocking my gun safe to show him one of my guns when he grabbed my bedside pistol which didn't have a round in the chamber, racked the slide, and said, "Is this thing loaded?" To which I replied, "It is now." I got my gun away from him and him away from me as fast as I could. I didn't turn my back on him again and he's never been back.