Divorce is too easy for starters. Rather than work on problems, people just walk away. Lack of spiritual and moral guidance.
Everyone wants to get married in a church in God's presence, but no one wants to follow God's advise. Lack of commitment. Alcohol abuse, drug abuse.
It gets worse with each passing generation because fewer and fewer people are brought up with any sort of spiritual and moral guidance. Perhaps there should be a mandatory marriage school that must be completed before people get married. The church (Catholic) used to make you go to mandatory marriage school, so maybe some secular form of that should be made mandatory. Human relation class in high school?
" ... maybe some secular form of that should be made mandatory. Human relation class in high school?"
that's not a bad idea, till you realize who would come up with the curriculum, the fine folks that bring you 'family life education' and all relationships being equal, yada yada.
The Church(es) should go back to mandatory pre-marital counseling. Our society is collapsing before our very eyes and the mainstream churches are busy being social advocates for everything and everybody but the people who are or should be in their pews.