South Korea for decades has been taking advantage of our defense expenditures on their behalf to bolster their own non-defense economy.
They have indeed, but it doesn't cost them much as our stupid government happily pays the bill to keep communist China and N. Korea in check. That means that we pay the bill for the defense of a foreign nation. It is the same in NATO, where we pay 25% of the annual costs and put up almost 50% of the equipment and infrastructure.
It isn't like these countries don't have the money today to pick up the cost but it is just too good of a deal that American workers pay for their protection.
I don't think that use of the military is a socialist or capitalist ideal. Some people seem to believe that paying for a standing army is socialism but it isn't. Socialism is not defined by the necessary government services, only the unnecessary ones. While we can debate about the size and scope of the military needed, it would most likely be agreed that some military is needed no matter what. Public infrastructure is not socialism as once a need of the public for infrastructure is identified, building it does not increase the individual citizen's control. It is not a substitute for the need to produce for your own welfare.
Socialism is about providing the worker with control of the system of their labor. S. Korea is not socialist. Social Programs can be argued to provided for some measure of socialism in that some programs are a replacement for work. Things like welfare, medicare....these provide individual benefits specific to a user that reduces or eliminates their need and or desire to provide these same individual benefits for their own well being.
Yes, there is some of this in every society because people have an innate desire to care for the less fortunate and the sick or injured. But this again, doesn't make the society a socialist society.
Words have become twisted through the centrifuge of politics. The meanings begin to be distorted over time as the different forces within a society try to steer the masses to a desired result. Today we make up compound words or alternate words to play with the definition of things instead of discussing the true desired results.
Capitalism has been slowly eroded into Oligarchy or Corporatism not because of the function of economics but because of the function of politics. Communism has softened into Democratic-Socialism to explain that we aren't talking about the people owning a larger stake in their own production but of government owning a larger stake in it for the good of the society. Taxation has become a force against income inequality but we never discuss the time inequality of those who work to support to their own families and pay taxes to support others and those who stay home all day and have all this "creative" time paid for by the efforts of the workers who are actually just losing more control over their own production.