So are most people. A lot of people during world war 2 also couldn't really donate much. They could also do work to help like gathering scrap or helping in factories. It was a different time... [Yes, he knows quite a bit about World War II. As to be expected from a Captain America fan.

Coulson is mainly pissed that Fury did it at all.]

Well. It worked. Ah, the Avengers are a group of well, superheros. Really it was more of a initiative than a group, but they came together as a team in the end. And stopped an alien invasion.