Probably true. What's the relevance here? (Clearly there is a demand for what NASA's employees do, since someone gives them money to do it. I would guess that the love:money ratio is higher at NASA than at most companies. The most visible things NASA does are science and space exploration, and both seem to me like paradigmatic examples of things that enrich society (unless by "enrich" you mean "provide money to", I guess).

Perhaps there are lots of people employed by other bits of the government who are parasites according to your criteria, but you've not exactly been specific about who. What exactly is your point?