I think there are a few people here who are mistaken about what the word "benevolent" means.
Perhaps 200 years ago one could apply that word to our nation, but not now. Not that all our citizens and gov't are bad, just most of them.
I think you are being irrational and failing to compare the United States to other nations that achieved its level of power.
As far as Global Super Powers go, we are benevolent.
Rome, Athens, Carthage, Persia, Babylon, Macedonia, Britain, Spain, Portugal, the Netherlands, Germany. At the height of their power those nations were not benevolent, and were routinely engaged in conflicts with their neighbors and other nations.
Compare this to the United States, and the relative benevolency of the United States should be self-evident.
If you are referring to Gulf War II, there is no such thing, it is a continuation of Gulf War I, a conflict that was brought about by Iraq invading Kuwait, and was never officially ended with a peace treaty, but was halted with just a cease fire.
If you are referring to Afghanistan, then consider this parallel. If a person you owed nothing to killed your neighbor and then came to your house and asked you to stay there (and you let them) would you then refuse to hand them over the the police when you found out that they had killed your neighbor would you refuse to hand them over?
Or if maybe they just robbed your neighbor, would you refuse to hand them over to your neighbor so he could demand his property back (or turn the person over to the authorities)?
Afghanistan decided to hide behind the flimsy shield of hospitality instead of respecting the right of the United States not to have psychotics attack it. We then decided that Afghanistan was making itself complicit in Osama's acts and punished Afghanistan for its refusal to let us have Osama.
I believe that both conflicts we are involved in are justifiable.
Assuming of course that 9/11 is not an inside job...
If 9/11 is an inside job, then we are wrong about Afghanistan, but I have not seen a convincing argument that was not refuted to make me believe that 9/11 was an inside job.