Payment comes in many forms. When a dictator on the other side of the world needs a "democracy" shot, or a country needs some additional sanctions for national security, the fact that European countries offer support makes the difference between greed/aggression and a "righteousness".
You're saying all the US leadership chain (the people with the authority so decide strategy) agreed to spend billions extra just as a charitable act for another continent. The only way I can take the best interpretation of this is to assume you're joking.
http://www.importanceofphilosophy.com/Ethics_Benevolence.htm...
Seriously? You'd expect an invasion from Canada, or Mexico?
I am not against a powerful military, but it seems the US has gone way beyond that and mostly projects its force around the world, with poor results to show for everyone including the US.
It isn't threatened because of its powerful military; also why Europeans can spend all that money on healthcare instead of defense: a benevolent democracy to provide safety. Not to mention it stokes the richest economy and innovation.