The purpose of telling this story, I want to introduce two key words, "siren" and "scare the common people". Let me ask everyone a question, what is the status of the four words - police badge, policeman, police car, siren in our hearts? They are sacred, powerful, efficient, and safe synonyms. Even we, the most kind-hearted ordinary people, will be nervous when we occasionally hear the siren, and feel uneasy when we encounter the policemen. So what kind of anger must people have to gather the courage to smash and burn the office building of a county public security bureau?