A 76-year-old former top bureaucrat of the farm ministry arrested for the murder of his son suggested during police questioning that his son's social withdrawal and violent behavior were the motive behind the act, investigative sources said Sunday.The police arrested Hideaki Kumazawa, also a former Japanese ambassador to the Czech Republic, on Saturday for stabbing his 44-year-old son Eiichiro to death at their home.Social withdrawal was recently highlighted again as a serious social problem in Japan by a mass stabbing Tuesday in Kawasaki near Tokyo by an assailant who is said to have hardl…READ FULL ARTICLE