For whatever it's worth, it's my perception that even within the US there are many who come from a culture where it's expected for adults to settle down and raise a family at some point in their lives. That describes my background, and I would like to have kids myself.

I believe for many, the desire is there, but it's not so strong as to overcome the forces against it. It's a major life decision and can make the difference between relative financial stability and a decent retirement or struggling their whole lives and standing in a grocery store all day bagging groceries to keep a roof over their head in their 70s.