What would be the 'rational' response of a member of the American lower middle class, to the following:

> Now that we have run through the history of inequality and seen the forces that push it around, we can evaluate the claim that the growing inequality of the past three decades means that the world is getting worse—that only the rich have prospered, while everyone else is stagnating or suffering. The rich certainly have prospered more than anyone else, perhaps more than they should have, but the claim about everyone else is not accurate, for a number of reasons.
>     Most obviously, it’s false for the world as a whole: the majority of the human race has become much better off. The two-humped camel has become a one-humped dromedary; the elephant has a body the size of, well, an elephant; extreme poverty has plummeted and may disappear; and both international and global inequality coefficients are in decline. Now, it’s true that the world’s poor have gotten richer in part at the expense of the American lower middle class, and if I were an American politician I would not publicly say that the tradeoff was worth it. But as citizens of the world considering humanity as a whole, we have to say that the tradeoff is worth it. (Enlightenment Now, Chapter 9: Inequality)

What would an 'irrational' response be? Or perhaps Pinker's stuff just isn't meant for consumption by the American lower middle class?