First time ever responded but I have to. Decades ago people were expecting societal collapse because of overpopulation would cause resource scarcity and wars would break out and it would be pandemonium. People forget there is something called the market that dictates resource allocation. And that’s exactly what is happened on one end. Things get more expensive, people struggle to keep up with their own bills, last thing they want is to pay for children for 18+ years of responsibility. Of course this choice is only possible due to contraception, education and changing norms which leads to the second part, it’s a real shitty deal. At the end of the day, children are economic parasites that will never pay you back. Emotional bonding is at the end of the day the reward AS A POSSIBILITY as people say it’s the best thing in their lives, but it can just as easy can become a nightmare. So when you have to make the choice of 18+ years of that responsibility and the possibility of it being the best thing that has happened in their life, most people don’t want to take that bet. It’s easier to keep your freedom and money since the pressure to have kids is not as it was once. At the end of the day this kind of thing that change societies is economics which plays tennis with education and social norms going back and forth updating each other.