There was a murder case in Guizhou where three grandparents and grandchildren were killed. Why did the killer commit the crime?

There was a murder case in Guizhou. Three grandparents and grandchildren were killed, and the murderer chose to commit suicide. The scene looks like a son-in-law having sex. The reason why the three grandchildren were hurt was also because the third daughter and the third son-in-law had an argument during the chat, so the son-in-law killed his parents-in-law and killed the little girl in a rage. When the younger son arrived at the scene that day, the daughter had lost her breath and her elderly parents fell in a pool of blood. The scene was in chaos, and the couple's youngest son squatted next to the body and cried. The third son-in-law committed suicide after killing, and the suicide place was in Mingdong Reservoir.

First, brutally beat the old couple over 70 years old and have two sons and six daughters. The old couple rented a house in the city center and opened a clinic. At that time, the granddaughter of the old couple saw this situation and chose to run to the door for help, but the little girl was too thin to run away from the murderer, and was killed by the murderer only 20 meters away from the murderer.

Second, of course, there are policemen on duty at the crossroads. After the incident, the police immediately chose to surround the scene. The murderer chose to flee the scene after committing the crime, and the police did not find the murderer. Granddaughter is only twelve or thirteen years old, and her personality is very clever and sensible. As a result, she was brutally killed by the murderer. It can be seen that the murderer is also cruel. At that time, a middle-aged man passed by and saw this situation and began to call the police. When the middle-aged man ran to the front, he found that the little girl had no life.

The old couple's personality is also very friendly, and the neighbors all think that it is impossible for them to offend others. Although the ambulance rushed to the scene immediately, the parties had no breath. No matter what the purpose of this murderer is, it has caused serious harm to society and must not be let go.