Because many people these days marry for the wrong reasons. Some marry because they think it's the right age to get married, some marry because they have been pressurized by society's expectations, some marry because they fear loneliness, some marry because they are afraid of being left on the shelf. But how many people marry out of true love? Without the foundation of love, how will a marriage be able to go through thick and thin and survive all obstacles?
There is nothing wrong with marriage, but it's people marrying for the wrong reasons that resulted in divorce. The article below is a great example of how marriage with the foundation of love is like:
San Diego couple married for 75 years die within hours of each other holding hands | Daily Mail Online
^ The couple in this article above are actually childhood sweethearts, they were married for 75 years and they died hours apart holding hands. This is an example of a marriage that is totally based on true love, you can tell that this couple is totally in love with each other. Successful and happy marriage does exist out there, but both couples must be deeply in love with each other in order for the marriage to work out.