I live in Missouri, and we have had two children killed in my grandparent's rural town (less than 500) in the last 5 years as a result of loaded guns in the house. I would presume that these kids, like myself, were raised on a tradition of hunting, and knew a thing or two about gun safety.
These accidents happen. They are preventable, but not entirely. The fact that we have so many firearms in our society means, statistically, that we will have people accidentally killed. The question is whether those deaths are worth the cost of having an individual right to firearms. Many on the left would say they are not. I would suspect, many on the right, to lean the other way on that question.