Yali's question sets the agenda
In 1972, a New Guinean politician named Yali asked Diamond why white people had brought so much "cargo" — steel axes, matches, medicine — to his island, while his own people had so little of their own. Diamond spent decades trying to answer that question honestly, without falling back on the lazy and racist assumption that Europeans were simply smarter or more inventive.
He frames the entire book as a rebuttal to that assumption. If intelligence isn't the answer, something else must explain the wildly different trajectories of societies on different continents — and that something has to be traceable, testable, and free of moral judgment about the peoples involved.
This framing matters because it turns a question usually asked with a shrug ("that's just how history went") into a scientific puzzle with an actual answer. Diamond's project is to find the deepest possible causes, peeling back proximate explanations like guns and ships to get at why some societies had those tools and others didn't.
Takeaway: the real question is never "who was better," but "who had which starting conditions."