I agree the dad was doing most of the holding, but the kid had good trigger finger discipline and muzzle discipline, he did actually demonstrate decent fire control when firing. NO he is not ready to be on his own with even semi auto versions of these firearms, but as was demonstrated, close adult supervision, why not? The event where the child was killed by a full auto getting away from him, TRAGIC, and that is all I have to say.
I learned a valuable lesson that I still apply today, even more so as a gunsmith. Colt gold cups have an extra spring that loads the sear against the hammer, very small and easy to lose and very easy to misassemble and make it load the sear away from the hammer. This can cause the pistol to go full auto, Old friend who worked for the indoor shooting range and detail stripped his gold cup, reassembled incorrectly the spring aforementioned. He went out on the range and like many of us have done a hundred times, locked the slide back, inserted a full mag, 7 rds at that time and dropped the slide using the slide release, with the pistol loosely held in his strong hand, it went FA, he was no where in control physically or mentally, he was lucky, 3 230grn hard ball rounds in his left wrist, arm and bicep. Ran out of ammo before it might have reached his face or head. Some of you might not like this, but this how pistols are designed, I always drop the slide with the trigger held back, that engages whatever disconnector the pistol has, it is safer than dropping the slide with the trigger forward. Any firearm, rifle, pistol or shotgun that has been worked on, even by me, gets dry fired and operated as hard as possible with no ammo, to see if the hammer or the striker has the least instinct to drop when it should not. After I perform a trigger job on anything but a revolver, I load one round at a time, and fire, then go to 2 rds until I feel good about everything. Old boss of mine took me to the indoor range and wanted me to shoot 100 rds through his Grizzly .45 win mag,so he could download the brass for milder loads. But before I started shooting, he said it had been doubling on him, and had just got it back from being repaired, How many 2 shot magazines do you think I shot before I loaded it all the way up?

8 rds of .45 winmag on FA, NO thanks.