Like, where does this come from? Even people that aren't particularly conservative seem to think that less people = good. Maybe the problem isn't the amount of people but how their needs are met? Yes, the world is finite, but pretending that hunger, homelessness, wars and diseases are in anyway caused by the amount of people on Earth rather than how we deal with those things is as insane as denying climate change.
Because they never hear anything else in the topic. Mainstream media are full of casual neomalthusian takes because any real answer to the question is anticapitalist and we can't have this.