Couple of days ago, Croila posted about her son being given a toy gun. It seems there are an appreciable number of parents who are concerned about their offspring running about with plastic gun-shaped toys. I remember quite clearly my little brother and his cronies with cap-guns and plastic rifles &etc.
The comments she got pretty much summed up what a lot of parents find out - you just can NOT keep the gun away from the boy. If you won't get them a waterpistol, or a cap gun, or a battery-powered noisy machinegun, they will turn a stick, or a cardboard tube - or even just their FINGERS into a gun.
I suspect this is some kind of testosterone-based thing, probably ingrained into genetic memory. What did kids do before there were guns? Pieces of wood as swords, no doubt. Before that? Probably tree limbs as clubs. Since we come from a common "hunter/gatherer" past, I suspect that this "survival skill" of learning how to kill things is something males are genetically programmed to do.
I do know that my little brother and his friends were fiends for guns when they were small. They were also fiends for Tonka Trucks. They also loved the 3 Stooges, and once all gathered underneath one of my Dad's big old wool army-surplus blankets and marched around the neighborhood chanting "Hey, Hey, get out of our way, we just got back from the USA".
I have no idea why.
I do know that of the 6 boys next door (Gah, Mrs. Murphy was ALWAYS pregnant...) and the 2 from down the street that I have some knowledge of, none of his friends became either a truck driver or a mass-murderer. In fact, the little bro is St. Paul the Lutheran Minister. The only person to whom he has indicated he wishes to do bodily harm is, in fact, Senator Clinton from NY - but I suspect that he's just yapping out his ass on that.
So... My advice to parents with concerns about their kids and toy guns is "take a deep breath, count to 10, try to teach them about the REALITY of gun safety and use if appropriate, then let it go - this too shall pass."