I grew up around them, so I guess I don't see it as such a big deal. Kids hunt, and kids usually can't use an adult sized gun.
But, any responsible gun owner knows that you don't keep guns unlocked with kids around.
Phoenix, I can relate to your story.
I find it odd that the Dad noticed no issues. I wonder if he was so busyt shtupping his girlfiend that his son suffered a little benign neglect.