The right to self-defense is fundamental to a free people. So says the Second Amendment, and Americans hearing it loud and clear are the proud owners of guns enough to arm nearly every man, woman and child. When ne’er-do-wells turn their weapons against the innocent, it’s responsibly armed citizens who must provide defense in the absence of the police. That’s why rules that force concealed carry permit holders to leave their firearms at home when they travel are foolish rules. Congress must finish the job of empowering the good and responsible man and woman with a gun.