I actually agree with the OP on this...why on earth would the parent of the two boys buy them "clear" guns that actually shoot pellets or BB's? I can't find a majority of the fault on the boys here, obviously they are stupid for shooting guns like that, but I doubt that being the way our society is these days, have little idea of consequence or responsibility at that age.
Either way, the parents are undoubtedly responsible for buying the guns. I remember there was a thread in the Newbie Section where a parent was trying to find some information regarding airsoft for his son. THAT is proper parenting. Education and warning children of consequences.
But again, another hit to the air gun/airsoft situation.
What's more important: morality or the freewill? In our society most people would say freewill. But we mustn't forget our morality.
Our morality guides our freewill to do the right thing.