I wasn't commenting on what they ought to do, it's not like I'm disappointed they didn't do a startup (lol how could I be disappointed in someone becoming a doctor when I'm the kid of refugees?) . Just commenting on the dynamics of who decides to try, and who knows who.
Keep in mind that as an immigrant you also you also only know a few traditional things a kid can do. The main thing that would get you into a startup is probably a CS degree, which what not high on the list for my aunts and uncles.
This might also be something about American society. People seem to cluster very closely with similar people. At least when I go there it seems that way.