Who do you think is to blame? Our lives are the result of the choices and decisions (we) make. Each of us is responsible for our own happiness.
Some young people believe if they have "adult responsibilities" it will make them an adult or the world will view and (respect) them as adults. Immaturity is all about "short-term" thinking.
The main problem with getting married too young is not knowing what you don't know about (yourself, about life, what you want and need in a partner for life). You usually have not thought things through and don't have a "plan" for their future. "He who fails to plan, plans to fail."
Getting married without having embarked on a strong career path makes it difficult to handle the responsibility of paying a mortgage, car notes, insurance, food, clothing, and if a young couple starts having children too soon they really set themselves up for highly stressful times. Awhile back I wrote a hub on this topic which applies to both men and women. https://hubpages.com/relationships/5-Reasons-Men-S...