(CNN) -- Our gun debate continues to revolve around measures to prevent deranged people from using military-style weapons to massacre innocent people. This is a worthy goal. We should do all we can do, within the limits of our Constitution, to reduce the number and deadliness of these tragedies.
But I am increasingly concerned that the debate will never evolve to include deeper sources of gun violence in our country. After all, most people killed by guns in the United States are not killed in school massacres by villains carrying AR-15s.