I am honestly in good faith attempting to argue that this way of thought is a slippery slope for other things that don’t necessarily include murdering specific groups of people and can still be considered fascist. For example, which solutions would you suggest?
To be clear, I am not saying I disagree with you in the regard that in our current society more people means more pollution and a higher rate of environmental destruction. Your wording just seems off.
I’m not sure what a solution is but I do think that we should encourage people to not have children, stop handing out the baby bonus, and reduce immigration. I feel these moves can provide a (non-genocidal) way to relieving the pressures of human overpopulation. For example, Japan is doing great work in reducing their population, a trend that will reduce the strain of housing and services in that country.
If you check fertility rates you will see that people aren’t willing to have children like they used to do. And it doesn’t seem that Japan is seeing their population decreasing as a good thing.
