How about liberating European nations from Hitler? Did that make us great? How about expelling Iraq from Kuwait? Did that make us great? I'd say that bothdid. I agree that what the government DOES do and what it SHOULD do are rarely ever the same thing. The transference of wealth to others violates the "legitimate need/unable to meet the need criteria that I listed for people that SHOULD be helped.
All wars are the result of those in power to gain power and money. WW2 was no exception if the entire backstory is known. We still occupy Germany and Japan all these decades later.