Not defending OP. But whenever we talk about overpopulation the conversation will automatically shift to limiting some races to have offspring. (Even you commented on incentivizing poor communities to not have children. Guess who is going to be disproportionally affected by this).
I don't think that overpopulation is a problem today. Population collapse due to concentration of capital and power is.
...where do you think there are the highest suicide rates? In the rich neighborhoods? Which neighbors do you think the accumulation of capital and power is hurting the most and will continue to hurt? You are not damaging the comunities by paying them to have less children, unless you value life but not the lack of suffering by such lives.
Our carbon footprint would be an eight fraction of what it is if there was only 1 billion people in the world, current state of climate change would still be decades away giving us a bit more time to gradually change course, and consentration of wealth and power would be less dramatic as the workforce will be more limited (supply and demand for money itself).
I don't think that overpopulation is a problem today. Population collapse due to concentration of capital and power is.