One of the most amazing aspects of the gun-control fight in America is how short-sighted the focus on guns and violent death is. I don’t refer only to gun-control advocates when I say this. Of course, I support the right to keep and bear arms, and I encourage every law-abiding American to consider owning a gun for self-defense. Unless you are in one of the high-risk groups — convicted felons, people with serious depression or other mental illness, or people with substance-abuse problems — or live with someone in those high-risk groups, having a gun available to you has very...