@snood,
When you say serve the "greater good" I assume you mean the people. However, the "greater good" by those that were here first, and were underwriting the hazardous voyages from Europe might have meant the wealthy. Not having had family here until the late 19th century, I don't want to trivialize those that came here earlier, and had many in their families die from all sorts of diseases, and did the proverbial heavy lifting, so my family came to a fairly habitable country. Perhaps, we need to find a way to eliminate the inequality of educated, and marginally educated, before we want to be so concerned about the greater good. But, I could be wrong. Education might not be a deodorant for one's social class that one is born into?
And, the country does attract the industrious, brainy or not. It might just be that the USA is one of the few countries with the ability to be socially mobile? If that is so, should it really be concerned with the greater good, or just the continuation of social mobility for the talented, or lucky family of the talented?