I've been saying for quite some time that the US is the world sucker, the dumb rich kid picking up the tab for everyone just to be popular, while being ridiculed for stupidity behind his back.
There are few issues here:
1. Military dominance IS required. It's not a matter of political stance. Nationalism and isolationism is dead, our lives are interconnected in infinite supply chains. A good example is the rare earth metals China threatened to stop exporting or, more obviously, oil. There are some strategic assets like chip manufacturing fabs in Taiwan and Korea from which most of the chips come. If China were to move in on Taiwan or North Korea were to attack South Korea you'd be fucked beyond belief.
2. There are forces which strongly oppose the West and would use every opportunity and every inch let go by the US to gain dominance. Russia, China, Iran, and of course stateless terrorists. Some won't fire one bullet in the process, that's not to say their sphere of influence isn't extending.
3. Europe is too lazy, hypocrite and liberal to fight for itself. Like the liberals of US, it prefers to stick its head in the sand and let US armed forces do the dirty work, only taking the head out here and there to complain about innocents getting hurt.
4. NATO is dysfunctional anyway, it spans too many countries.
NATO should be torn down and reorganized. Central command, NO discretion of any sole country about the participating forces (i.e. the governing body will determine exactly how much resources are devoted by each participant), no more than 4-5 strategically located countries with strong armies. I'd also like to see much stronger R&D and training cooperation between parties compared to NATO.