The main reason for the younger age of campus violence is that the complexity and mobility of society lead to premature children. In the past, children were taught by parents and teachers, but now children are influenced by the whole society. All kinds of live broadcasts, film and television works and social conditions are affecting children. When children are exposed to some violent behaviors, they can't get the correct guidance, and the three views of not growing up and the particularity of teenagers' rebellious period make them think that violence is a cool behavior. They imitate it and don't think it is wrong for them to do so.
Teachers are responsible for teaching learning, and parents are often too busy to guide their children's three views. Nowadays, parents tend to pay more attention to their children's academic performance and ignore their psychological growth. Parents' indulgence or being too strict with their children will lead to children's rebellious mentality, and at the same time vent their negative emotions such as dissatisfaction and anger on weaker children, which is the root cause of school bullying.
It is also interesting that the standard of the age of criminal responsibility in the law is debatable. Nowadays, many children rely on their age and know that they are hurting others, but they know that they will not pay the price. These demons covered with children's appearance are the most terrible. They deliberately violate the law and commit crimes when the law can't restrain them, but they can escape the punishment of the law. This is really hateful.