Evolution and the fact that the only humans who survive future disasters, which all eventually will happen, will be those who have support systems from off-planet, mean that you're incorrect in the long run. Worst case scenario, 99.9% of people are like you say, but when future disasters happen, the 0.1% who survive because they have off-planet support (or are off-planet themselves) will be 100% of humanity's future from then on. https://medium.com/non-violence/overpopulation-pshaw-we-need-to-settle-the-galaxy-anyway-ed8e35c733e8