First off, this is just your anti-human opinion. "overpopulation" isn't anything approaching a fact.

Beyond that though, have you considered the second order effects of population reduction? What happens when the non-productive share of the population becomes 80%? How many things we enjoy in our way of life that are predicated on increasing populations?

Is it really pro-human to want to live like factory-farmed cattle? Nobody ever seems to engage with the fact that the population shot up, what, 10+ times in the last 200 years.

I'll happily engage with the fact. It's great news! Humans are awesome, all my favorite entities are humans! Everything good about my life was provided by me (a human) or another human. Hope it 10x's again!