“If you use a gun to rob somebody, screw you. No gun for you again, ever.”
If the law does not order the execution of a person, it should not deprive him of his right to self-defense.
If you want to ensure that an armed robber never again owns a gun, you should lobby to have armed robbery punished with the death penalty.
That's a little harsh, even by my standards.
(shrug)
No, I'm fine with an armed robber just going back to jail for a long stretch if he's caught in possession of a gun.