Don't be naive. It killed the common man. The ruling elite and the finance machines of the West made and makes trillions from warfare. Also doesn't your description over the complication of ww2 sound eerily similar to the chaos currently being engineered across Eastern Europe and the Middle East?
I honestly believe we are seeing the engineering of the third great war occuring right before our eyes with Ukraine and ridiculous levels of funding for IS from America's allies In the middle east Saudi and Qatar. Much profit to be made from war!!