On March 23, 2010, Zheng Minsheng (郑民生) 41, murdered eight children with a knife in an elementary school inNanping , Fujian province
An attacker named Wu Huanming (吴环明), 48, killed seven children and two adults and injured 11 other persons with a cleaver at a kindergarten in Hanzhong ,Shaanxi on May 12, 2010
On 4 August 2010, 26-year-old Fang Jiantang (方建堂) slashed more than 20 children and staff with a 60 cm knife, killing 3 children and 1 teacher, at akindergarten in Zibo , Shandong province.
In September 2011, a young girl and three adults taking their children to nursery school were killed in Gongyi , Henan by 30-year-old Wang Hongbin with an axe
William Unek was an African police constable and mass murderer who killed a total of 57 people in two separate spree killings three years apart. His first murder spree occurred near Mahagi, Belgian Congo in 1954, where he killed 21 people with an axe, before escaping and finally ending up inBritish occupied Tanganyika Territory . Apparently because of social misunderstandings with his boss, Unek went on a second rampage which began in the early hours of February 11, 1957. Armed with a stolen police rifle, 50 rounds of ammunition and an axe, he started killing people in the area of Malampaka, a village about 40 miles southeast of Mwanza . Within twelve hours Unek shot dead ten men, eight women and eight children, murdered five more men with the axe, stabbed another one, burned two women and a child and strangled a 15-year-old girl, thus killing a total of 36 people.   He then changed out of his police uniform into clothes stolen from one of his victims and fled. Among the dead was reportedly his own wife, whom he killed in their hut, before setting it on fire, as well as the wife of a police sergeant.
By the end of the day Wirjo had hacked a total of 32 people, most of them farmers on the way to their fields and students going to school. 18 of his victims died at the scene, while two others later succumbed to their wounds in hospital.
Everyone realizes that knives can kill people, so I'm not really sure what your point is.