This.
Also, it's not a small matter to be without a father. We learn about God and authority itself from our fathers. If our fathers are absent or gravely defective, our notion of God ("Our Father in Heaven") becomes warped.
The modern world acts like fathers are optional -- take em or leave em. They couldn't be more wrong.
And as we see in statistics for fatherless children, children without a father figure are several times more likely to turn to drop out, turn to crime, become drug addicts, and father illegitimate children themselves. It is statistics like that which remind anyone of sense that the laws God gives us are not there just for His benefit, but also for our own. Marriage isn't just some arbitrary institution as liberals would have us believe, it's a union that unites the wedded and serves as a glue for the family, ensuring the long-term stability and happiness of all the family. And that in turn leads to the children being raised well and disciplined. Modernists act as if marriage is a limitation and that people are so much happier and "liberated" when let fornicate, but every statistic shows that men and women with multiple life-time sɛҳuąƖ partners are far less happy than those with just 1, with their unhappiness increasing with the number of partners. And as we know from fatherlessness statistics, it harms their children too.
The world has simply forgotten discipline. They think that because their mindless hedonism feels good in the short-term that it is good. But fornication, onanism, etc. can be compared to food in a way. Yes, gorging on McDonalds may feel very nice, but as everyone knows it's very unhealthy. And all the crimes against natural law are just the same, while they may feel good to fallen man in the short-term, in the long-term they'll only give you misery. If only those unmarried mothers realised this.