Originally Posted by
Fox3WheresMyBanana
You are thinking of the 'Just War' doctrine of the Catholic Church, as originally espoused by St Augustine of Hippo, with contributions by Thomas Aquinas and others. The clause is part of the Catechism of the Catholic Church.
I remember giving a lecture on the topic, pointing out that this clause was b#llocks and using Thermopylae as one of the examples.
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Cheers fella I was starting to wonder if I had made it up