I don't think that overpopulation is a problem today. Population collapse due to concentration of capital and power is.
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).
Another perspective is whether not doing anything (and by "doing" I mean simple public health measures like free condom distribution and family planning, education about the impact of human population, or, more succinctly, "no Hitler-y stuff") would ultimately yield more harm to minorities as they'd be the first to feel the impacts of population stress.