Maybe the 10 year old was from a household where guns were forbidden, and nobody taught him/her gun safety? Maybe gun safety should be taught in our schools, from an early age?
When our girls were still preschool, they were taught all about gun safety. They could handle every gun in the house. They could hold the butt of a 12 gauge pump to a tree, and shoot it. Of course, our hands were on the shotgun at the same time. It took the "What's this?" out of the equation.
We still kept all guns out of their reach, unloaded, and with trigger locks. Our goal was for the times that they may be visiting some of their little friends, and one of their little friends found a gun. Our girls knew how to secure it, empty it, remove the clip, engage the safety, swing open the cylinder, until an older, responsible person could be apprised of the situation.