In the United States, the Supreme Court reinstated capital punishment in 1976. The death penalty is allowed in 31 states, but four—Washington, Oregon, Colorado, and Pennsylvania—have moratoriums. According to the latest Gallup poll available, from 2014, 63% of people favor the death penalty. This is down from a peak of 77% in May of 1995, one month after the Oklahoma City bombing. A few years earlier, in 1989, researchers Hans Zeisel and Alec Gallup analyzed how public opinion of the death penalty was changing, as measured using the same Gallup poll, which asked simply: “Are you in favor of the death penalty for a person convicted of murder?” They found that the simple poll question didn’t quite capture the complexity of people’s feelings, and also that the strong increases may be due to general feelings of alienation.
Gallup first asked about people’s position on the death penalty in 1936. The approval rating hit 68% in 1953, before falling to 42% in 1966. Then it started rising again without interruption until it reached the 71% in 1986.
The fact that less than 10% of respondents are “undecided,” suggests that the death penalty is indeed a polarizing issue. However, people don’t feel equally strongly about it, and about one-seventh of all people who favor the death penalty would change their minds if the alternative was a life sentence without the possibility of parole.
The authors argue that people tend to give two main reasons for favoring the death penalty: that it will deter murder, and that a life for a life is morally acceptable. Delving deeper into the data, Zeisel and Gallup found that about two-thirds of the respondents believe that it deterred murder. Of those who do not favor the death penalty, 20% still believed it was an effective deterrent. They then found that, when presented with evidence that the death penalty was not actually an effective deterrent, support fell from 71% to 55%. This is important, since many researchers believe that there is still little evidence that the death penalty reduces crime. When the researchers asked whether a person would still favor the death penalty if life without parole were an option, support fell to 52%.