An explanation of rich/poor gap

I read a review in the WSJ of a new book that explains the connection between Education/Marriage/Income

It goes like this..

College educated women give birth out of wedlock at only 5% of births. Women with a HS diploma or less have 50% out of wedlock births. The in-between statistic is women with some education after HS.

Explanation: Likes attract. Therefore, lower class women have a pool of potential mates in lower class males who don't have good job prospects and qualify for govt programs which reduce their incentive to work (and a higher percentage of criminal records).
Result: The lower class woman's only option for children is getting pregnant without benefit of marriage.

OTOH, college educated women are around LOTS of good male marriage prospects on campus and in early job experiences. So, those women become more picky. They choose husbands who will be good providers and don't settle for boyfriends getting them pregnant and moving on.

The Cycle: Since there is a positive correlation between education:income, the married people with education make more money and have children much more likely to go to college since they live in a stable family environment.

OTOH, the lower class woman has a much less stable home life, financial life and prospects for her children because daddy (or daddies) are no longer around.

Bottom line... the increase in cyclical poverty in the US is not due to unfairness or inequality. It's due to the abandonment of marriage as an institution. Thoughts?