It seems to me unrealistic to view marriage and divorce in simplistic terms. There aren't many things in life that are more complex than marriage and divorce. Having gone through both marriage and divorce, I think popular culture grossly distorts both marriage and divorce.
Since this is a huge subject, and since marriage and divorce are so intimately related, I will confine my remarks in this post to just three points about marriage. Points that each have something to do with divorce.
In the first place, most folks are unprepared for marriage, IMHO. They have no idea what they are really getting into. They have insufficient skills to deal with marriage. Worse, they have a strong tendency to believe that all they need is motivation to make a marriage work, so they don't get help. It is thus not at all surprising to me that the divorce rate is 50%. Actually, it surprises me it is not much higher, around 75%.
I don't care how motivated someone is, without solid and realistic technique motivation is worth nothing. You can desire more than anyone else to go to the moon, but if your technique for getting there is to flap your arms like wings, you ain't ever going to make it to the moon. In the same way, you can want marriage more than anyone, but if your technique for dealing with marriage sucks, you are not going to ever have a happy marriage, no matter how long you stick with it.
But popular "wisdom" will tell you that all you need is love, or all you need is determination, or all you need is more motivation, and you'll be fine. Popular "wisdom" is made by, and made for, the village idiot. Just as a matter of fact, most people would benefit from seeking marriage counselling as soon as they contemplate getting married, let alone after they get married.
In the second place, professional marriage counsellors estimate that a quarter of all married people have no business being married to each other. Those include cases in which even highly motivated people with good skills for dealing with marriage should not, according to the pros, be married to the person they are married to.
This again contradicts popular "wisdom", which too often says that anyone who works hard enough for it, will be rewarded with a good marriage. But if you're married to the wrong person in the first place, it doesn't matter how hard you work for a good marriage, you won't have one. That's what the pros are telling you.
Last, it is a complete myth that an unhappy marriage has no effect on kids so long as the couple stays together. I am not talking about an unhappy abusive marriage here. It should be obvious to everyone that an abusive marriage is without redeeming qualities worth staying married for. But there is a myth that a normal unhappy marriage has few if any effects on children worth getting divorced over.
The truth, according to the pros, is children learn both what kind of marriage to expect for themselves, and even what kind of marriage to seek for themselves, mostly from their experience of their parents marriage(s). When a kid grows up observing an unhappy marriage, the kid is at risk of later on entering into a copy cat unhappy marriage of his or her own. Unhappy marriages breed unhappy marriages.
But popular "wisdom" will tell you that the kid will grow up with the same chances of entering a happy marriage as anyone else. Again, popular wisdom has nothing to do with what the professional counsellors see in their practice.
Given how unprepared most people are for marriage, let alone for divorce, it seems utterly extraordinary to me that only 50% of marriages end in divorce. I would recommend that people start marriage counselling from the day they decide to get married, rather than wait until their marriage is too messed up to save.