Logans Run too

I recently read Niven's ringworld (1970). All the intelligent species had overpopulation problems, dealing with it in different ways. It was just a given that it was an inevitable consequence of an advanced species.

It was really jarring to consider it. I'm old enough to remember the (now recognised as disastrous) one child policy of China but even so the way it was presented as "of course there have to be population controls" actually took me out of the narrative.