Children who suddenly run amok or act violently without reason are reacting against bad home environments and not their teachers, according to a report on a survey released recently by an affiliate of the Education, Culture, Sports, Science and Technology Ministry.

Such behavior by children is the result of an inappropriate upbringing or a tense situation at home, such as friction between parents, according to the survey by the National Institute for Educational Policy Research.

Only 5 percent of such cases were the result of inappropriate treatment by teachers, which came last on the list of reasons, according to the survey, which was supported by the education ministry.