9 yearold with an uzi? i know of one incident a few years back, it was a micro uzi and it was at an expo.... there was a big fallout and the guy responsible was also LE, and got put in jail I think.
while i dont own an uzi, nor the want, one of the common overlooked problems with semi-automatic firearms, is that they can fail and become fully automatic, if the firing pin is dirty or damaged. this can kill a person if they cannot control the recoil.(unexpectedly even.)
It's hard to comprehend that one day i could kill my child by giving him a car. but, one day he will be of age and it will happen. It's my job to get him to the level to be responsible for those actions. People say children shouldn't do High-power rockets, I think they are wrong. As you say, the highest level and quality of supervision is imperative, and directly impacts the level of safety.
I can't go to Vegas, as it is against my personal moral compass...