Notes

Abolitionists may be contend that the death penalty is inherently immoral because governments should never take human life, no matter what the provocation. But that is an article of faith, not of fact. The death penalty honors human dignity by treating the defendant as a free moral actor able to control his own destiny for good or for ill; it does not treat him as an animal with no moral sense

People fear nothing more than death. Therefore, nothing will deter a criminal more than the fear of death... life in prison is less feared. Murderers clearly prefer it to execution -- otherwise, they would not try to be sentenced to life in prison instead of death... Therefore, a life sentence must be less deterrent than a death sentence. And we must execute murderers as long as it is merely possible that their execution protects citizens from future murder
Society is justly ordered when each person receives what is due to him. Crime disturbs this just order, for the criminal takes from people their lives, peace, liberties, and worldly goods in order to give himself undeserved benefits. Deserved punishment protects society morally by restoring this just order, making the wrongdoer pay a price equivalent to the harm he has done. This is retribution, not to be confused with revenge, which is guided by a different motive.