Did you teach your son to look both ways before crossing a street? How about being careful with sharp kitchen knives or not touching a hot burner in the kitchen? If you thought enough of your son to teach him how to behave safely in the presence of these common dangers, then why have you failed to teach him how to safely handle a firearm? You can't be present to supervise you kids every moment of their lives. If you take the time to learn safe handling of firearms, they are no more dangerous than a kitchen knife or a fast car. Remaining ignorant is a sure way to encourage tragedy at some point in the future.
All of my kids have been taught safe firearms handling and basic marksmanship. They handle guns safely and have no "curiousity" about something they have been prevented from handling. Your local range can provide training. An afternoon shooting a few boxes of .22LR at the range is cheap entertainment.