An excerpt from, "Nuclear Weapons And Our Catholic Response" United States Conference of Catholic Bishops:
The Catholic Church’s teaching requires that any use of force be proportionate and discriminate. It must not produce more harm than good and must respect noncombatant immunity and protect civilians. The Church has long opposed the use of nuclear weapons, especially against non-nuclear threats, and the development of new nuclear weapons. The Church urges that nuclear deterrence be replaced with concrete measures of disarmament based on dialogue and multilateral negotiations.
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“What can be said, too, about those governments which count on nuclear arms as a means of ensuring the security of their countries? Along with countless persons of good will, one can state that this point of view is not only baneful but also completely fallacious. In a nuclear war there would be no victors, only victims. The truth of peace requires that all —whether those governments which openly or secretly possess nuclear arms, or those planning to acquire them— agree to change their course by clear and firm decisions, and strive for a progressive and concerted nuclear disarmament. The resources which would be saved could then be employed in projects of development capable of benefiting all their people, especially the poor.” - Pope Benedict XVI, 2009 World Day of Peace Message, no. 13.
An excerpt from, "What the Catholic Church Teaches on Nuclear Weapons" Catholic Peace Action:
The Catholic Church has always been consistent that there can be no moral case for the actual use of a weapon of mass destruction as it is indiscriminate. On this basis the bombings of Hiroshima and Nagasaki in Catholic teaching are indefensible.
These writings however did not close the discussion as it was argued by many leading Catholics that the concept of nuclear deterrence would not only prevent the use of nuclear weapons but even prevent war itself. A balance of terror they argued would at the height of the Cold War preserve peace if both sides had nuclear arsenals. Pope St.John Paul II gave some support for this position when he wrote in 1982 to the United Nations,
“in current conditions deterrence based on balance, certainly not as an end in itself but as a step on the way toward a progressive disarmament, may still be judged morally acceptable.”For Catholics in a nuclear weapons state this was a very interesting time with debate for and against the possession of nuclear weapons. These debates and exchanges continued for many years with respect shown on all sides.The Scottish Catholic Bishops in 1982 also made a statement,“If it is immoral to use these (nuclear) weapons it is immoral to threaten their use”For many years the official position of the Catholic Church remained that of Pope St.John Paul II but the discussions continued and as time progressed the conditional acceptance of nuclear deterrence became more difficult to sustain as it became more evident the condition of progressive disarmament was not happening.In 2005 Archbishop Migliore, the then observer of the Holy See to the United Nations wrote,“The time has gone for finding ways to a balance in terror, the time has come to re-examine the whole strategy of nuclear deterrence…it is evident that nuclear deterrence drives the development of ever newer nuclear arms thus preventing genuine nuclear disarmament.”
