Car-centrism in urban design wasn't an accident. It was intentional to create indebted workers who now needed to borrow money to buy cars and houses. 30 year mortgage are a relatively new phenomenon.
Likewise, we have people working 2 or 3 jobs to make ends meet. This again is intentional to extract even more surplus labor value from people. This comes at the cost of people spending time outside of work, including with their families.
Destruction of community is a side effect of this and that too is intentional.
A much more minor point that is worth mentioning is that there are a lot of people who have children who don't actually like children. Or they want adult children without going through all the steps to get there. These are people who will intentionally work late to avoid chaos at home or have really time-consuming hobbies (eg distance running) that take them out of the home for significant periods of time.
Some of this I can attribute to the insecurity of not being able to provide for material needs. And that's the part capitalism plays.