I don't know how well it works on Trump supporters, but there's something that bugs me about this argument. It seems to take a moral issue (do you treat other people well?), and replace it with an economic issue (do you know of inventions, food, or some economic benefit from those people?). I feel like it's a racing certainty that many Italian-Americans lived ordinary lives, and didn't do anything out of the ordinary—it's a quality shared by the vast majority of all people regardless of their origins. Shouldn't that be okay too? Otherwise, how important would someone have to be? Can we use binary search to find out?