Recently, famous politicians in Korea were attacked by assailants one after another, shocking our society. Moreover, the shock is even greater because the perpetrator who attacked the female member of the National Assembly, A, was a 15-year-old minor. Similar cases are occurring in foreign countries as well. Sudden attacks on politicians shock the general public and lead to a crisis in democracy. This is because in democracy, even if opinions differ from one's own, a point of agreement is found through dialogue, and in this process, concessions and compromises exist. Simply launching a physical attack without using these peaceful solutions does not help anyone. It is simply a personal deviation and a criminal act that vents anger and hatred. In a democratic society, freedom of expression is guaranteed to everyone. There are various systems in place to do that. However, finding a physical solution without following such procedures is not the answer. The problem is the structural environment of our society in which such incidents continue to occur. Therefore, we need to understand the circumstances under which such actions can only be carried out boldly. We must identify the dangers of violent extremism that is deeply rooted and widespread in our society and seek fundamental remedies and countermeasures against it. Efforts to achieve this require integrated efforts from various levels, including not only the political world but also the local community, academia, and the media. The argument that in order to prevent the spread of violent extremism should be recognized as a whole-of-society problem rather than the existing state-centered response and that solutions should be found through integrated efforts of the government, businesses, schools, and civic groups is gaining persuasiveness. Therefore, this study was conducted with the purpose of deriving lessons from this incident, identifying diagnosis and countermeasures for it, and preventing recurrence of similar incidents to protect people's lives and create a safe society. Measures derived from this study include: first, nurturing youth into sound citizens; second, integrated efforts are needed to resolve the hatred and conflict prevalent in our society; and third, strengthening personal protection measures for prominent social figures such as politicians. It has to be done. This study is meaningful in that it diagnosed the cause and proposed countermeasures despite the limitations of understanding the exact facts of the actual incident. It is believed that follow-up research on integrated efforts to prevent violent extremism in local communities should continue in the future.