The reason the founders chafed at the idea of an American standing army and vested the power of war making in the cumbersome legislature was not to disadvantage us against future enemies, but to disincline us toward war as a general matter... With citizen-soldiers, with the certainty of a vigorous political debate over the use of a military subject to politicians' control, the idea was for us to feel it- uncomfortably- every second we were at war. But after a generation or two of shedding the deliberate political encumbrances to war that they left us... war making has become almost an autonomous function of the American state. It never stops.
When civilians are not asked to pay any price, it's easy to be at war - not just to intervene in a foreign land in the first place, but to keep on fighting there. The justifications for staying at war don't have to be particularly rational or cogently argued when so few Americans are making the sacrifice that it takes to stay.
The artificial primacy of defense among our national priorities is a constant unearned windfall for some, but it's privation for the rest of America; it steals from what we could be and can do. In Econ 101, they teach that the big-picture fight over national priorities is guns versus butter. Now it's butter versus margarine—guns get a pass.Overall, we're weaker for it, and at enormous cost.