I agree that Nate Silver's book is short on many subjects (such as politics) but the goal of his book is not to explain "Why did X happen" but simply to discuss

I agree that Nate Silver's book is short on many subjects (such as politics) but the goal of his book is not to explain "Why did X happen" but simply to discuss the challenges of prediction within different domains. It's a book that helps people learn the art/science/challenges of prediction. Saying that his book lacks detailed discussions of incentives (while true) misses the point of his book.