All Western nations spend less in the order of magnitude of half on Healthcare. The US spends 17 percent of its GDP on Healthcare and around 4 on military spending. So if you would add that same percentage of GDP completely to what these nations spend on Healthcare they STILL would not spend as much as the US on its for profit Healthcare system.Denmark vs United States: Military Facts and Stats
Armed forces
22,000
Ranked 92nd.
1.37 million
Ranked 3rd.
They do not need to spend a whole lot of money on the military so they have extra money that can go to social programs.
So just this one aspect of social security would more than offset the increase.
I'm not taking into consideration that most Western nations buy their military hardware often from the US there by directly supporting and enriching the US.