It also reinforces the "America is NUMBER ONE!!" domestic populism that many politicians on the Right consider their bread and butter.
I am perfectly OK with seeing the US as just another industrialized nation; We dont really NEED to be a hegemon. We only do so because we are decadent and (as a culture) simultaneously lazy and programmed to be slaves to large interests-- (However strange that may seem.) Complacency more than anything drives domestic (citizen-level) views about foreign policies, and financial interests drives the political will behind our foreign policies. That complacency in the first is driven by the public being simultaneously drenched in a propagandized narrative in the mainstream press, and overall saturated in idle entertainments while at home as a balm against the brutish reality that most americans work more hours and get significantly less vacation or leave time than other industrial nations, and it is costing them in both mental and physical health.
The combination of intellectual laziness + attention saturation + physical exhaustion results in a public that just rolls over for whatever is going on in congress. As long as they can get beer and football during superbowl season, and the cable bill is not too high, they are OK with whatever. Invade Canada? Ok, fine. Sure.
I really hope that getting some socialist programs in to seriously curtail the workplace exhaustion front, along with better regulations to curtail the propagandized media front, will result in a more interested and active voter demographic, which will take a keener interest in foreign affairs... But this is probably a vain hope of mine.