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Ethics · College

War and Just War Theory

Just war theory's criteria for when war is justified and how it should be conducted, from an intro ethics course.

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What does just war theory attempt to do?
Identify moral criteria for determining when military force is ethically justified and how it should be conducted.
What is jus ad bellum?
The set of criteria for determining whether it is morally justified to go to war.
What is a just cause for war according to just war theory?
A morally legitimate reason, such as self-defense against aggression or protecting others from grave harm.
What does the criterion of legitimate authority require?
Only a proper governmental authority, not private individuals or groups, may declare war.
What is right intention in just war theory?
The actual motivation for war must align with its stated just cause, not be driven by hatred, greed, or territorial conquest.
What does the last resort criterion require?
Military force should be used only after peaceful alternatives like negotiation, diplomacy, and sanctions have been exhausted.
What is the probability of success criterion?
A military action should have a reasonable chance of achieving its just objective and not be undertaken if defeat is certain.
Should a state formally declare war before attacking?
Yes, according to just war theory, a state should publicly announce its intention to use force and its reasons, rather than launch surprise attacks.
What is jus in bello?
The set of principles governing how war should be fought, including proper treatment of combatants and civilians.
What is the principle of discrimination in warfare?
Combatants must distinguish between military targets and civilians, directing force only at legitimate military objectives.
What does proportionality require during military operations?
The force used in an attack must be proportional to the military advantage gained and not exceed what is necessary to achieve the objective.
What weapons are prohibited under just war theory?
Weapons that are inherently indiscriminate or cause excessive suffering, such as chemical and biological weapons, and torture.
How must prisoners of war be treated?
They must be treated humanely, without torture, execution, or other inhumane treatment.
Can military bases be targeted under the discrimination principle?
Yes, military bases are legitimate military targets and soldiers are combatants, so targeting them does not violate discrimination.
Under what conditions can civilian infrastructure be targeted?
Only if it directly contributes to military operations and the civilian harm is not excessive relative to the military advantage gained.

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