Because we're anxious about our investments in soylent green.

They're concerned about "their" people, because it's declining only in rich countries and those tend to see themselves as "better" and don"t like "unregulated immigration" (while the regulated one costs shit tons of money). Also those who bring thst up are usually right-wingers.

Or to say it bluntly: Xenophobia and racism.

Because it means there will be a larger burden on (smaller) younger generations to look after the aging ones.

Instead of 6 kids and 30 grandkids, you maybe have 2 kids and 1 grandkid, if you're lucky.

It is definitely true that by lowering the amount of food waste (like food retail companies letting their employees bring almost expired food home to consume etc etc). I just unfortunately assume that we won't really improve in this food waste area.

Eugenics and genocide in the name of overpopulation could theoretically go into power (or comeback with eugenics), although I think the chance of that happening will be low, atleast in countries like Europe and north american countries, but your point is understandable.

'I have been assured by a very knowing American of my acquaintance in London, that a young healthy child well nursed is at a year old a most delicious, nourishing, and wholesome food, whether stewed, roasted, baked, or broiled.'

There must be a limit on how many people earth can house.

Saying "not limit" would be an irrational dogma. Earth have limited resources, people will need some quantity of resources per capita, thus there cannot be infinite people. Simple logic.

Once the existing of a limit is accepted we can and should discuss what number it is.

There's always too many people when you ask a person like this about the population, but never enough people when you ask the same person the same question but include skin color in the question. F everyone who whines about population.