Dirius, in an ideal world, every pregnancy would be wanted.
In the world we live in, sometimes women (and their sex partners) definitely do not want a baby. But she becomes pregnant anyway.
Unwanted pregnancy is not always a case of sheer careless. Birth control methods can fail. Condoms do this with some regularity. Teenagers may be ignorant of girls' fertility cycles and think she can't get pregnant if they do it just once.
Your argument about "financial ruin" is just pernicious. Poor people have most of the children on the planet, in case you haven't noticed. Maybe you've also noticed adult children caring for the ill and aged parents. Check out the costs of caring for the advanced elderly sometime.
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When my son and daughter-in-law were expecting, he was just over the moon. I asked him how long he had wanted to be a father. His answer was, for his entire life. Now they're especially involved with their son's sports activities.
{Deleted attacking comment~moderator}...you might consider why the upper-middle and upper-classes continue to support marriage at rates higher than for the lower-middle income people in North America. Often later in life, but nonetheless happening. Maybe it's because two orthodontists' incomes are better than one. Maybe it's because two investment bankers can afford a nanny, and to send their children to private schools and ivy league colleges.
Maybe emotionally mature people don't always divorce at the sign of an argument. If they can manage their money, maybe they can also manage their tempers. Maybe it's because money buffers more of the strains felt by lower-income people.
You might think more deeply about the different personal finances of different socio-economic classes.
Because most pregnancies are the result of a choice, the same as marriage. You choose to get into those things. Pregnancy has the risk of financial ruin for both men and women, but in most cases (excluding the result of rape), pregnancies are the result of consensual sex.
I understand your view on marriage, but then lets re-introduce the concept of divorce "at fault". Lets say the woman cheats and leaves - why should the husband pay alimony? And if the woman is not financially stable to care for the child economically, and the father is, why not give custody to the father? If he is the one mainly supporting the child economically, he should have custody.
Lets make divorce great again! and make it fair for both. Its a very complicated thing - and in most cases divorces benefits the women more than the man. That is why men, don't want to get married anymore.