As of 2007, 90% of Japanese support the death penalty, according to the Mainichi Shinbun.
Supporters say that capital punishment is applied infrequently and only to those who have committed the most extreme of crimes—a single act of murder does not attract the capital punishment without additional aggravating circumstances such as rape or robbery. ... However, the very small number of executions is due to the rarity of extreme crimes in Japanese society rather than because of an unwillingness of the authorities to carry out executions.
Since executions resumed in 1993, a rise in street crime during the 1990s, the sarin gas attack on the Tokyo subway in 1995 and several high profile brutal murders have hardened attitudes amongst the public and the judiciary. Since 1999, there have been a series of cases in which criminals sentenced to life imprisonment have been given the death penalty after prosecutors successfully appealed to the Supreme Court.