Sometimes I wonder about people (actually I wonder about people a lot - I'm very nosy).  But sometimes I wonder about specific people and why they bother to stay together.  Some couples don't seem to like each other very much and seem to always focus on the other's faults rather than their good points, delighting in pointing them out to others.  

Yes, we have moved on with the complaints, and it is more likely to be about table manners than domestic violence, but even so, it puts a listener in a rather iniquitous position - do you agree and be seen to condemn someone or disagree on principle and accuse someone of lying.

In this particular case, I took the coward's way out and changed the subject.

I had to open a conversation. “So, how long have you been married?” “Forty years.  Still trying to improve him.” I wonder whether perfection is attainable.