Those of us who believe in the death penalty for some murders are told by opponents of the death penalty that if the state executes an innocent man, we have blood on our hands. They are right. I, for one, readily acknowledge that as a proponent of the death penalty, my advocacy could result in the killing of an innocent person. I have never, however, encountered any opponents of the death penalty who acknowledge that they have the blood of innocent men and women on their hands. Yet they certainly do. Whereas the shedding of innocent blood that proponents of...