If you put it that way, that opens up a huge list of "necessary" wars that really aren't.
Also, I refuse to believe that there is a clear aggressor to most wars, despite what people want you to believe, its multiple responses building up until something breaks. By the time it started, WW2 was inevitable, there had to be a response to Nazi Germany and Imperial Japan's latest, disturbing, responses, but not in any way necessary as if decisions had been made different earlier on, it could be avoided.
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