The 100 richest people in the world earned enough last year to end extreme poverty suffered by the poorest on the planet four times over, Oxfam has said.
When you look into the issue, the push for population control came from the rich. They are the first to subsidize birth control/sterilization over economic stability and investment in the developing nations. In fact, the goal is that they're not fully free to develop and have sovereignty when they accept aid from these groups.
It is commonly said, that there are too many mouths to feed. Their mouths can be fed, and with proper ethical investment by the richer individuals. The lower classes can not revolt, there soon be too few of them. The rich just need enough poor to serve them. To them, the rest are waste.