Q: Do you think the world (human civilization) has already passed its best point, or is that yet to come?
A:(McArdle): Mathematically, it is likely that we are near the peak of human
population. On the other hand, I'm encouraged by the incredibly rapid economic
change going on now. I think that getting richer has made us more moral - more
careful about human life and suffering. So if we keep getting richer, I expect
that we will also get better, with more morality, more art and culture, and more
of almost every other good thing.
Well, that explains a lot. Namely why McArdle thinks rich people are better than poor people. And why we, the richest country on earth, are so very, very good to everyone else on the planet.