(1) People who are more intelligent, more successful, and/or financially better off, have higher marriage rates (though they tend to get married later in life), fewer children, and lower divorce rates than the general population. Duh. And they live longer, too, and live in bigger houses.
(2) Divorce rates are a tricky thing to follow, and any source you see quoted should be examined closely for bias or abject stupidity. Note that overall divorce rates are meaningless. The only definitive divorce rates that can be stated are divorce rates of people who are basically all dead, because until at least one party to a marriage is dead, it is not possible - statistically speaking - to say whether that marriage ended in divorce or death. For example, I got married in 1973, but it is impossible to say RIGHT NOW whether my marriage will end in divorce.
(3) To say that people living together can be as "moral" as a married couple is asinine Liberal bullshit. You have redefined "moral" into meaninglessness. It's like saying you can be an illegal alien, yet still be a law-abiding citizen. It ain't possible.
(4) If a woman has a child out of wedlock, then it can be said with absolute statistical certainty, that the child is more likely to be poor, to fail in school, to adopt anti-social or even criminal life habits, to be sexually promiscuous, to live as an adult on welfare, and to spend time as the guest of the state penal system at some time in their lives. None of this is written in concrete for any individual child or mother, but the statistics are stark. In fact, a white child born to a single mother is more than three times as likely to live in long-term poverty as a Black child born into a two-parent family.
(5) Statistically speaking, getting married is a way out of poverty. People who (a) finish high school, (b) get a job (even a MW job), and (c) get married before having children, are only 20% as likely to be long-term poor as people who fail to do those things.