"I obviously don't understand the whole globalization thing as I can't see why the US feel the need to be the ones responsible for responding to the hack."
I have no argument with your post, it's entirely reasonable, unlike most of mine.
But you do seem to have missed the various actions of the USA over the last few years.
Team America: World Police, that's where we've been since the 50's.
And don't forget Team Britain: American Puppet, we are almost as bad as we accept anything they tell us, even if it was G.W. Bush speaking.