The point being that he's confusing a committed relationship with having a marriage certificate. In Europe, of couples with children, > 30% are cohabiting. In Iceland it's > 60%. Do you suggest that 60% of cohabiting Icelanders are unhappy because they don't have a marriage certificate on hand?
I suggest that American results are more pertinent to Americans than European results are, and vice-versa. Did you see this article from a few days ago?