How many adolescent boys live in a home with their biological father married to the birth mother? We are raising an entire generation of folks being told fathers are not really important... that Government will be substituted for fathers. How many generations of messed up males are we willing to accept?
The assumption that children raised by their biological father and birth mother are always better off than otherwise is simply wrong. Of course it's the ideal family structure, but even when it's present, it isn't producing responsible and self sufficient kids automatically - it depends entirely on the character of the parents [separately and together].
Having no father present is better than having one who is alcoholic [personal experience on this subject], or so workaholic as to be rarely seen, or so emotionally unavailable as to be more harmful than helpful, or a rigidly strict disciplinarian who drives his children to escape [whether physically or mentally], or one who teaches that violence solves problems, etc, etc, etc.
As you pointed out already, this is no longer Mayberry, RFD, and the traditional nuclear family has become something different in many cases. Maybe not as ideal, but under the circumstances [should I have raised my child with an alcoholic father who was frequently in jail or inpatient treatment?] the best that can be managed. The children of nontraditional families are not automatically worse off, and often much better - that's a fact you don't like to acknowledge, apparently.
Finding solutions to problems starts with accurately assessing and defining the problem, and I just don't think the lack of residential fathers plays such a major role in today's societal ills.
I'd place more 'blame' on the lack of solid education, glorification of violence, ubiquitous advertising that stresses competition over cooperation [and the value of 'stuff'], and most especially the stress of financial problems placed on working people who don't earn enough to provide a decent standard of living - unless they work 2 [or more] jobs, in which case, how much parenting can they do? [That one I also know from personal experience!]
Financial stresses can undo even the 'best' parents, and it's my belief that getting them gainfully employed with a living wage would do wonders to improve the family structure, however it's composed.