Sociological research shows that illegitimate children are seventy percent more likely to be expelled from school; half as likely to do well in school; over twice as likely to have illegitimate children themselves; almost twice as likely to get divorced if they ever do marry; less likely to use contraceptives as teenagers; 25 to 50 percent more likely to suffer from anxiety, depression, hyperactivity, or excessive dependence; twice as likely to engage in antisocial behavior; and two to three times more likely to need psychiatric care. All these results are based on studies that held other variables (such as race, parental income, or parental education) constant.

http://www.i2i.org/main/article.php?article_id=479

This does not say that support for single parent families causes the children to have illegetimate childern,although it could be a factor.

I think the empahsis should be placed on preventing single parent families. Otherwise the number of single parent familes will keep growing.