Keep in mind that a lot, if not all, of those countries exist under the umbrella of protection that the United States military provides, and thus do not have the same budgetary requirements for their own forces. Otherwise, time to start learning how to say "Please don't shoot" in Russian.

(edit: don't take the above as the complete-picture, by any means, it's just another rarely-mentioned factor that I wanted to bring up. I believe there's a sweet-spot to be found for taxation & social-programs that has a net-gain for society.)