I read an article pointing out that second marriages are more likely to end in divorce than first marriages. The presentation seemed puzzling to me, because it doesn't quite account for one crucial fact.
If you are already divorced, then your second marriage is automatically less likely to end in divorce than your first. In other words, the idea of a second marriage only arises for someone whose first has already ended. If the first ended in divorce (not death of the spouse), then the second marriage by definition has a better than zero chance of not ending that way. So instead of thinking you have a 60% chance of divorcing, vs. a 50% for a first marriage, the person marrying a second time might compare that 60% to the 100% certainty that their first marriage has already ended.
What the story didn't account for, then, was that people still married happily to their first spouse were not the ones contemplating marrying again.