Not to mention the fact that as long as all possible assumptions lead to the same conclusion, then conclusion remans valid regardless of which assumption is true.
Here, there is not a possible universe where the destruction of real property by a six year old warrants any kind of legal consequences to the six year old. Fuck, if a six year old had stolen their parent's gun and shot their neighbor's dog, I would be hesitant to say they criminal consequences are warranted.
I would think that possible criminal consequences for the parents would be in order. Please note the word: possible.
I grew up in a home with guns and knew the rules which were: Do NOT touch the guns and NEVER store a gun that has any ammunition in it and has not been properly cleaned first. Now, if we had been different children, the kind inclined to be curious enough about guns to disregard the absolute fact that our hides would be tanned but good, storing them in a closet or under my parents' bed would have been really foolish. But in those days, most people stored their guns--almost exclusively hunting rifles and maybe a shotgun or two exactly the same way my dad (and uncle and grandfather) stored theirs. One Christmas, my mother was really proud to have saved enough money to present my father with a fancy gun rack. But still: without my father's express permission and supervision, had I touched one of the guns, I can still imagine my rear burning and I'm sure I would still be confined to my childhood bedroom to this day.
Alas, we do not live in those times,for good or for ill. But these days, people seem absolutely certain that they need an AK15 or other semiautomatic high powered rifle, although almost none of them would be able to find a deer to shoot or know how to field dress it, etc. The NRA and the GOP have riled people up to believe that any day they will be overrun by black rapist drug dealers who want to get at your wife and your daughter and your grandma, too, so if you're a real man, you need to be prepared to defend them and also to defend yourself from a government who might someday care more about saving lives than funding the NRA and NRA backed politicians.
Too many people lack the sense to keep their firearms properly stored or maintained and away from children. Such individuals should forfeit their 'right' to own weapons.