The question of whether we're too few people or too many people is dancing around the wrong question. Whether you attribute this difference to nature or nurtur

The question of whether we're too few people or too many people is dancing around the wrong question. Whether you attribute this difference to nature or nurture, different groups of people have wildly different levels of consumption, productivity, crime rates, scientific achievements, and other attributes. The real problem we're faced with is that it's the most productive societies that are not reproducing. Would anybody fear the overall quality of life on planet Earth if productive, low-crime, and scientifically motivated Japanese people (as one example) were the ones suddenly reproducing like crazy and there were an extra billion Japanese people on Earth in 25 years and an extra 5-10 random Japanese families moved into your neighborhood?