There's also a long history of people using environmental concerns related to overpopulation as cover for racism or other bigotry, so bringing up world population without qualification can feel, unfairly or not, like a racist dog whistle people are reluctant to engage with.
Well you are absolutely right, what i mean is, we are to many peoples, seen from the point of a planet and not country's, just look at something big like oceans/fish, how many more people can we feed with that source without "drying" it out? Fish-farming? Where comes the food for the fish then from? I don't even touch the land farming, wheat etc.
But we'll have to treat the entire planet as a tool for our use and that's sad, putting it mildly. The ocean used to be brimming with life and now we treat it like a food factory and a road for our ships and talk about dead zones and garbage islands. There's no humane way back but we can mourn what we've lost.