Just War theory
A Just War is one which has to be fought but is conducted according to certain conditions. These were developed by Thomas Aquinas (c1225-74) and Francisco de Vitoria (c1483-1546) and are still referred to by Christians today.
The theory is not intended to justify all wars but to prevent them by showing that going to war - except in certain limited circumstances - is wrong. The intention was to motivate states to find other ways of resolving conflicts, prevent war and to limit its effects.
The conditions of a Just War are:
Some wars can appear to meet all of these conditions. For example, World War Two (1939-1945) would appear to have been a Just War:
This looks as though it was a ‘properly constituted’ Just War, but actions like the Allied bombing of Dresden, a two-day raid by almost 2,400 bombers that destroyed the city and killed perhaps 135,000 civilians to virtually no military purpose, certainly broke the final condition.
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