Katsuji Nakazawa is a Tokyo-based senior staff and editorial writer at Nikkei. He spent seven years in China as a correspondent and later as China bureau chief. He was the 2014 recipient of the Vaughn-Ueda International Journalist prize.

Left to right: Tianjin Tower pays tribute to Hu Youping on June 28. A bouquet is offered for Hu Youping near a bus stop believed to be the site where Hu was attacked by a knife wielder going after a Japanese mother and child on June 30. (Source photos by Kyodo and AP)
Other stabbings reflect a society that cannot vent its social and economic frustrations