You didn't get what I mean. We need to foster a culture that prevents reckless growth by discouraging having more than n children per family. I'm talking cultur

You didn't get what I mean. We need to foster a culture that prevents reckless growth by discouraging having more than n children per family. I'm talking cultural peer pressure, not imposition. You can have as many children as you want (if you so selfishly want to behave), the important is that the majority of the population understands that they're not doing a favor to their fellow humans by having more than n children.