Earlier quoted context omitted.
The correlations are clear but causality less so. What if it’s not marriage that makes men happier, less prone to crime, and longer-lived - rather it is that women select for partners who are happier, less prone to crime, and healthier?
It's weird to try and explain this from a sterile alien-studying-humans perspective, but since that's the HN theme I'll do my best. Marriage and having dependents carries with it a lot of economic cost. By revealed choice theory, that implies it has significant benefits, or else nobody would ever do it.
People often do things that are not good for them.