us campus accident

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32 students had been killed in US campus by south Korean gunmen.He was also a student. why such type of accident take place.Not a single deceased student was enemy of the gunmen. He also committed suicide after incident. we cannot come to concussions that he was mentally sick,or he was mad,as for this mass killing,he used weapon,so he was already pre planed for that. Please comment on this topic,so we can know the views of everyone about the accident.