Charles Murray's WSJ article, The Hallmark of the Underclass, defined the problem. Fatherlessness --> underclass --> criminality. Dr. Reo Symes at Ace of Spades HQ examined it in The Underclass and It's Lack of Fathers and concluded that you can't unring the sexual revolution bell.

Thirteen years ago, Dan Quayle was pilloried in for expressing the idea that marriage is the best possible social program.

Nature abhors a vacuum. Where there are no mature, responsible men around to teach boys how to become good men, gangs serve in their place. In fact, gangs have become a surrogate family for much of a generation of inner-city boys. I recently visited with some former gang members in Albuquerque, New Mexico. In a private meeting they told me why they had joined gangs. These teenage boys said that gangs gave them a sense of security. They made them feel wanted, and useful. They got support from their friends. And, they said, "It was like having a family." "Like family" - unfortunately, that says it all.... I know it is not fashionable to talk about moral values, but we need to do it. Even though our cultural leaders in Hollywood, network TV, the national newspapers routinely jeer at them, I think that most of us in this room know that some things are good, and other things are wrong. Now it's time to make the discussion public.