Well, you're using data that doesn't reduce to what you want it to.
Divorce is only one possible indicator of unhappiness, there are lots of people who are unhappy and do not or cannot divorce.
You also assume that divorce leads to decreased happiness overall and I'm not convinced that's true either.
Moreover, I think it's pretty remarkable that almost 50% of people make a "successful" choice of a life partner. (Exclusively in the sense that they do not divorce.)
Considering how horrible people are at decisionmaking in general, and how vague and slippery the idea of "happiness" is, (see Stumbling on Happiness, and/or Mistakes Were Made for a great layman's overview), it's pretty remarkable... or merely a great indicator of how much people are willing to withstand/fool themselves/constrain their nature.
Divorce is only one possible indicator of unhappiness, there are lots of people who are unhappy and do not or cannot divorce.
You also assume that divorce leads to decreased happiness overall and I'm not convinced that's true either.
Moreover, I think it's pretty remarkable that almost 50% of people make a "successful" choice of a life partner. (Exclusively in the sense that they do not divorce.)
Considering how horrible people are at decisionmaking in general, and how vague and slippery the idea of "happiness" is, (see Stumbling on Happiness, and/or Mistakes Were Made for a great layman's overview), it's pretty remarkable... or merely a great indicator of how much people are willing to withstand/fool themselves/constrain their nature.