Family support networks relieve government and the public of supporting the poor and disadvantaged. A culture which emphasizes the individual over family tends to become overly competitive and to leave incapable people left to their own resources. It may over-emphasize superficial values like money and physical attractiveness. A man may tend to be rather uninterested in parenting or fatherhood until a woman teaches it to him, yet experience a reward as the child matures into a young adult. Look at the movies October Sky and One True Thing .
Marriage can become a cover-up for personal inadequacies.
But social conservatives might argue that this happens only because modern affluent society is insufficiently supportive of marriage. I would add that, if you want to be really free, you have to be able to deal with your personal shortcomings by yourself. To some extent, individual meritocracy is good. Young adults would have to think twice about elaborate career plans that apparently require postponing marriage and parenthood. One can experience faith and still own responsibility for one's own beliefs.