society's endorsement of the death penalty for murder is the legislative response to Furman." Both Congress and 35 states had complied with the Court's dictates in Furman by either specifying factors to be weighed and procedures to be followed when imposing a death sentence, or dictating that the death penalty would be mandatory for specific crimes. Furthermore, a referendum in California had overturned the California Supreme Court's earlier decision (California v. Anderson) holding that the death penalty violated the California constitution. The fact that juries remained willing to impose the death penalty also contributed to the Court's conclusion that American society did not believe in 1976 that the death penalty was unconstitutional. The Court also found that the death penalty "comports with the basic concept of human dignity at the core of the [Eighth] Amendment". The death penalty serves two principal social purposes—retribution and deterrence." In part, capital punishment is an expression of society's moral outrage at particularly offensive conduct". But this outrage must be expressed in an ordered fashion, for America is a society of laws. Retribution is consistent with human dignity, because society believes that "certain crimes are themselves so grievous an affront to humanity that the only adequate response may be the penalty of death". And although it is difficult to determine statistically how much crime the death penalty actually deters, the Court found that in 1976 there was "no convincing empirical evidence" supporting either the view that the death penalty is an effective deterrent to crime or the opposite view. Still, the Court could not completely discount the possibility that for certain "carefully contemplated murderers", "the possible penalty of death may well enter into the cold calculus that precedes the decision to act". Finally, the Court considered whether the death penalty is "disproportionate in relation to the crime for which it is imposed". Although death is severe and irrevocable, the Court could not say that death was always disproportionate to the crime of deliberately taking human life. "It is an extreme sanction, suitable to the most extreme of crimes." Historical disapproval of mandatory death sentences The Court was determined to simultaneously save capital punishment in the United States and impose some reasoned basis for carrying it out. That reasoning flows from the Eighth Amendment's cruel and unusual punishment clause. Although capital punishment, per se, was not found by the Court to be cruel and unusual, it