There is a need of power be balance around the world. If US is playing a good role to  balance power around the world, then I have no problems. if not US (a democratic/transparent nation) then a bordering nations (who are mostly selfish to their benefits) would have influence and will control the country/region and never ending war triggers around the world. Just look at Nepal, Selfish Indian wants to have influence in nepali soil to control every thing. Don't you want a more Democratic and transparent  nation  plays good role to resolves the problem.

I think, I want a democratic and transparent country like USA , but not China or Russia controls the world. Imagine, if china or russia starts controlling the world then there will be no Human rights, free speech, and democracy. China or Russia don't even respect their fellow citizens/civilian rights. It will be hard to imagine other country citizens right.

Therefore, you need a global force for better mankind.