I disagree. As a child, no one ever told me not to take a gun and point it at someone else in public, or hide it on myself. Common sense (unaffiliated with parental advisory) is key, the kid is stupid. By his age, he should have enough common sense to realize there was nothing smart about what he was doing, and if he didn't, he's stupid.
There may be kids who aren't stupid, but this one, is a prime example of stupid. This isn't to say all of them are, I know kids who are very smart.