Most of them are looking for someone to sleep with. Since in our society , culture and religion it is very hard to sleep with opposite sex without marriage that is why they get married.
These people do not believe that marriage is a contract , marriage is holy , marriage is an institution , marriage demands work to nurture and work to turn it into a beautiful relationship it is meant to be.
They are lazy , they do not want to work on mending the fences. Before they get married they think all their problems they are facing as a single person will be resolved and married life is a cinch. Once they get married they find out to their dismay that marriage has its own set of problems and issues and it is not that bed of rosed they hoped for , then they start to look for a scapegoat to blame for their misery. So their husband , their in laws , their parents are an easy target to put the blame on for their misery. If they put same amount of time in working on their marriage as they put in basing everybody for their misery, they will lead a happy and healthy life.
Can you relate to or oppose my POV ? If you can, go ahead, who is stopping you ?