12 Who was the murderer of the Songji massacre in August?

I have a colleague of Songji's, who is close to home. The reason for this is that the government cannot be trusted. The victim is the branch secretary of the songji Brigade, and the perpetrator is extremely resentful because he is dissatisfied with the branch secretary of the Brigade (every family builds a house, not his own). The victim's parents and younger brother died on the spot, and other family members were seriously injured, but the branch secretary was not at home that day, thus avoiding death.