What's so funny/sad is I bet there are kids out there that know how to shoot at that age. I knew how to by 1st grade. My uncles taught me. I've known kids that have gotten guns for birthdays before they could walk. In fact, I think my husband's dad bought him one the day he was born. He was going to give it to him when he got old enough to go hunting. He wasn't old enough to hunt by age 4 or so when his parents divorced, so I don't know what the age would have been.
Ah but you're forgetting that to some people a gun offers amusement. Think of hunters and people that shoot the flying disks. Also, learning to play an instrument is much harder than learning how to shoot.