From Kay Hymowitz' American Caste - Family breakdown is limiting mobility and increasing inequality:
...the single-mother revolution has left us with the following reality. At the top of the social order is a positive feedback loop, with kids raised in stable, high-investment, and relatively affluent homes going to college, finding similar mates, and raising their own children in stable, high-investment, and relatively affluent homes. At the bottom is a negative feedback loop, with kids raised by single mothers in unstable, low-investment homes finding themselves unable to adapt to today’s economy and going on to create more unstable, single-mother homes.
Not only do we have more poverty, inequality, and immobility; we have the makings of a caste society, with an inherited elite and an entrenched proletariat. That’s not an America that anyone finds very attractive.
Raising kids as a single parent is something that only extraordinary people can do well.