There are a lot of people (such as myself) that grew up poor, so we invest most of our energy into our careers to avoid falling back into poverty. Unfortunately, families are expensive and a great way to ensure you raise another generation in poverty.

It's no surprise that people are putting off marriage and starting a family if you don't want to raise children in the same situation you were raised in. It's a similar problem across the pond in Japan where people grew up in practically single-parent households due to the rigors of work potentially leading to Karoshi. So you have people either completely checking out of society, or focusing entirely inwards to avoid a repeat of history.