Wow, a great question.
When i was studying at a university, we had debates in history class about the war - the positive and negative sides. I had to defend the point of view that war is good.
Well, it looked challenging, but turned out that throughout history war was moving progress ahead and a good portion of inventions and progress first came as war weapons or as aid for armed forces. Later they were converted to peaceful goals. Medicine, machines, explosives and so on.

I know that is not the question of this topic, but you know this old saying: "the right one is the one who won", because you know, the winning side has to write the history. So I guess war or any conflict is inevitable - like it is inevitable that animals eat each other. Maybe there will be beter ways to solve conflicts than killing each other in future - I hope so.

Soviets and japanese both had their verisions of history - where they were very right.
Maybe UN is the good side - but it is not the side at all)