Dr. Suman believes it is because the family structure in Japan is very important. The government has gone out of the way in realizing that an intact family unit is a very important thing to maintain. Governmental policies foster it. Tax policies encourage it. University and school acceptance programs encourage it.
Children born out of wedlock can have a very difficult time in Japanese society.
Schools discriminate against illigitimate children and will refuse acceptance. There continues to be a sense of shame in Japan in looking upon children born out of wedlock. Japan has an intact family structure and that is incredibly important in terms of why the rate of violent crime in Japan is incredibly low. There are multiple factors, but perhaps the most relevant one is parental involvement in children's lives. A good value system is extremely important in children's lives, and it must be consistently applied - not just for children, but for adults.