Whoa, a hypothetical situation in justification of gun enthusiasm. I've never seen that before!
Did you ever find a loaded gun lying on the ground in the woods as a child? Did you ever have a kid pull a gun out of their parents' closet and say "hey check this cool shit out"?
Now before you answer these questions, don't bother, they're rhetorical. The solution to your hypothetical scenario is to tell your kid that if in the unlikely event they come across a gun, don't touch it.
This smacks of turning your kids into living breathing expressions of your personal politics. Let them grow up before they have to worry about whether they want to follow in Charlie Heston's footsteps.