America's massive military budget is irrational, costly and dangerous. Why isn't it a campaign issue?

What should be the most important issue in this election is one that is rarely, if ever, addressed: Why is U.S. military spending at the highest point, in inflation-adjusted dollars, than at any time since the end of World War II? Why, without a sophisticated military opponent in sight, is the United States spending trillions of dollars on the development of high-tech weapons systems that lost their purpose with the collapse of the Soviet Union two decades ago?