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A Just War is a war which is declared for right and noble reasons and fought in a certain way. A Just War is not a war that is ‘good’ as such – it is a war that some Catholics may feel to be necessary or 'just' in the circumstances, when all other solutions have been tried and have failed. It is a necessary evil and a last resort.

Catholic Christianity is not a pacifist religion although there are pacifists in most Christian denominations.

It's possible that some Catholics would support a war if it were justified by Just War standards.

What is the Just War theory?

The Just War theory was first developed by St Thomas Aquinas. Aquinas was one of the most influential theologians of the last 1,000 years. The theory set out conditions against which to judge whether or not a war should be waged (jus ad bellum) and if it could be justified, and how it should be waged (jus in bello).

Aquinas's conditions for a Just War – jus ad bellum

• The war must have a just cause - eg against invasion, or for self-defence - and not to acquire wealth or power.
• The war must be declared and controlled by a proper authority, eg the state or ruler.
• The war must be fought to promote good or avoid evil, with the aim of restoring peace and justice after the war is over.

Later conditions developed by other Christians - jus in bello

• The war must be a last resort when all peaceful solutions have been tried and failed, eg negotiation.
• The war should be fought with 'proportionality', with just enough force to achieve victory and only against legitimate targets, ie civilians should be protected.
• The good which is achieved by the war must be greater than the evil which led to the war.

The Just War theory, with some amendments, is still used by Catholics and others today as a guide to whether or not a war can be justified.

In the Catechism of the Catholic Church (2309) the Just War doctrine is laid out and gives four conditions that must be fulfilled for a war to be considered just:

• "the damage inflicted by the aggressor on the nation or community of nations must be lasting, grave, and certain;
• all other means of putting an end to it must have been shown to be impractical or ineffective;
• there must be serious prospects of success;
• the use of arms must not produce evils and disorders graver than the evil to be eliminated."

Why do some Catholics support the principle of the Just War theory?

Sometimes war may be necessary and right, even though it may not be good. In the case of a country that has been invaded by an occupying force, war may be the only way to restore justice. Pope Benedict XVI said defending oneself and others is a duty.

When wars are fought to protect people it could be seen as an example of Jesus' teaching:

Righteous anger is sometimes justified, eg when Jesus was angry about the presence of money lenders in the Temple, he:

Righteous anger is about using one's anger in a way that is thoughtful and controlled to bring about justice or to protect the weak.