Earlier quoted context omitted.
I find this to not be a helpful frame of thinking. A divorce is not a random natural disaster that befalls you. You have a lot of control about who you end up with, who you are inside and how you engage with your partner. So the fact that divorce happens "often" or "rarely" doesn't matter to an individual scenario - it's completely within those people's controls to make good or bad decisions.
I understand your point, agree to it somewhat, but I think is a bit unfair and simplistic. People have externalities thrown at them (loss, grieve, missed expectations, sickness, depression,…) Is a bit arrogant to think a person or a couple can navigate all these via their own choices. Reminds me of my hardcore catholic friends who think that divorcing equals to low commitment, willpower or maturity.
Using your example of depression. If you marry someone manic/depressive because you love how crazy and wild she is on her up days, her down days are going to hit you hard when you're living in the same house and sharing kids and responsibilities. So maybe that dynamic has a 50% divorce rate which could have been anticipated way in advance. On the other hand, there's always a chance that someone stable you marry will get into a deep funk years down the line and you won't be able to help her manage through that, but that maybe is a 2% probably. You can't control that 2% but you can manage to not be in the 50% and that's where your focus should be.