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I agree with you, sort of. Specifically, I will admit that there are some cases where something some people would call war is justifiable.

> war [can] be waged for justifiable and morally good reasons.

I am fairly sure that's not true. A real war, where both parties have a fair chance of winning, only has losers. Or if one side is much bigger, like the Netherlands against the Germans in 1940 or the USA against Iraq more recently, it's more of a coup.

Give one example of a war where both sides had a justifiable and morally good reason.

Why on earth would you ever expect both sides to have justifiable reasons?

Justifiable from their perspective. Most border disputes would fall under this, at various points in time both sides have controlled an area and believe that it is rightfully theirs.

"Justifiable from their perspective" is trivial. Given the wealth of examples, which GGP can be assumed to know about, that's not what they were talking about.

It's the only situation where a build up of arms before war is understandable. Massing arms out of defense is basically indistinguishable from preparing an attack.