Today’s Catechism sections discuss arms proliferation and modern war. Supporting material comes from the Pastoral Constitution, “Gaudium et Spes”.

2314 "Every act of war directed to the indiscriminate destruction of whole cities or vast areas with their inhabitants is a crime against God and man, which merits firm and unequivocal condemnation."109 A danger of modern warfare is that it provides the opportunity to those who possess modern scientific weapons especially atomic, biological, or chemical weapons - to commit such crimes.

2315 The accumulation of arms strikes many as a paradoxically suitable way of deterring potential adversaries from war. They see it as the most effective means of ensuring peace among nations. This method of deterrence gives rise to strong moral reservations. The arms race does not ensure peace. Far from eliminating the causes of war, it risks aggravating them. Spending enormous sums to produce ever new types of weapons impedes efforts to aid needy populations;110 it thwarts the development of peoples. Over-armament multiplies reasons for conflict and increases the danger of escalation.

2316 The production and the sale of arms affect the common good of nations and of the international community. Hence public authorities have the right and duty to regulate them. The short-term pursuit of private or collective interests cannot legitimate undertakings that promote violence and conflict among nations and compromise the international juridical order.

2317 Injustice, excessive economic or social inequalities, envy, distrust, and pride raging among men and nations constantly threaten peace and cause wars. Everything done to overcome these disorders contributes to building up peace and avoiding war:

Insofar as men are sinners, the threat of war hangs over them and will so continue until Christ comes again; but insofar as they can vanquish sin by coming together in charity, violence itself will be vanquished and these words will be fulfilled: "they shall beat their swords into plowshares, and their spears into pruning hooks; nation shall not lift up sword against nation, neither shall they learn war any more."111

IN BRIEF

2329 "The arms race is one of the greatest curses on the human race and the harm it inflicts on the poor is more than can be endured" (GS 81 # 3).

2330 "Blessed are the peacemakers, for they shall be called sons of God" (⇒ Mt 5:9).

The Pastoral Constitution, “Gaudium et Spes” discusses the horrors of modern war and arms proliferation.

80. The horror and perversity of war is immensely magnified by the addition of scientific weapons. For acts of war involving these weapons can inflict massive and indiscriminate destruction, thus going far beyond the bounds of legitimate defense. Indeed, if the kind of instruments which can now be found in the armories of the great nations were to be employed to their fullest, an almost total and altogether reciprocal slaughter of each side by the other would follow, not to mention the widespread devastation that would take place in the world and the deadly after effects that would be spawned by the use of weapons of this kind.

All these considerations compel us to undertake an evaluation of war with an entirely new attitude.(1) The men of our time must realize that they will have to give a somber reckoning of their deeds of war for the course of the future will depend greatly on the decisions they make today.

With these truths in mind, this most holy synod makes its own the condemnations of total war already pronounced by recent popes,(2) and issues the following declaration.

Any act of war aimed indiscriminately at the destruction of entire cities of extensive areas along with their population is a crime against God and man himself. It merits unequivocal and unhesitating condemnation.

The unique hazard of modern warfare consists in this: it provides those who possess modern scientific weapons with a kind of occasion for perpetrating just such abominations; moreover, through a certain inexorable chain of events, it can catapult men into the most atrocious decisions. That such may never truly happen in the future, the bishops of the whole world gathered together, beg all men, especially government officials and military leaders, to give unremitting thought to their gigantic responsibility before God and the entire human race.

Footnotes

109 GS 80 #3.
110 Cf. Paul VI, PP 53.
111 GS 78 # 6; cf. ⇒ Isa 2:4.