@Azure The erroneous "most people live in affluent Western societies" conclusion is related to the fact that all of this is a statistical argument rather than some sort of airtight deductive reasoning.
Sure, most people live outside of affluent Western societies, but a surprisingly high proportion do. It depends on how you measure it, but at least 1 billion people live in affluent Western societies, so at least 1-in-8 or 12.5%.