Protip: supreme uncontested military superiority on the planet helps.
Define 'helps'.
Involved in less wars? No.
Winning wars more often? Not really.
Sustaining less casualties in military conflicts? Less than the people the US is attacking, but more than the nations that are avoiding wars diplomatically.
Making military contractors rich? Yes, it certainly does help.
I think it is also worth asking about the phrase 'supreme uncontested military superiority'. If it is uncontested then who is the US fighting? More importantly why is the US often forced to pull out of conflicts without achieving their goals? Some Vietnamese peasants contested the supreme military superiority. Secondly why the word 'supreme'? Uncontested military superiority is pretty unambiguous. The only reason I can see to add the redundant word 'supreme' at the start is if you subconsciously have doubts that it is true and want to emphasise it to reassure yourself.
With regard to what Baffler said about US defence spending: Yes I am aware of all that. I never actually mentioned the middle east in the OP, except with respect to the historical examples of Thermopylae and Exodus. Your comment really has little to do with the question posed which was why if the US spends so much money on defence, is it involved in so many conflicts, and is defence even the right word for this given those numbers?
But since you mention the specific areas of spending I am happy to discuss them. Do you think funding the whole of NATO has increased the security of the US as a state? Do you think any increased security is commensurate with the cost of that program? You say 'The US military is basically defending the entirety of the Northern Hemisphere'... from whom? The unholy alliance of New Zealand, Namibia and Argentina and their unstoppable armies of ninja pirate zombies? I think perhaps the word 'defending' is the problem with that sentence, I would substitute it with something like 'controlling' or 'occupying'.
Let us pretend you actually believe the US is defending and protecting the world and without this expenditure everyone would be immediately crushed by the nebulous forces of darkness - What is with Sweden? Sweden is not a member of NATO, the US has no permanent military bases there, Sweden has a sane defence budget.
Shit your right! Sweden has been brutally pummeled by endless war for decades, their country is in ruins. I stand corrected.