No, kids being able to access a gun and ammunition is in fact a crime. But nice try - we do the same thing with car crashes, the 2nd prominent killer of adolescents, and predictably we do nothing beyond calling them accidents.
That's not a gun crime (at least on the part of the kid) it's an accident. Kids die in accidents, it's a very sad reality. It might well be negligence on the part of the parents or whomever let the kid gain access to the gun though.
