crime and punishment

Many Americans today still feel that capital punishment is a fair and necessary method of punishing their most violent criminals. One argument for the death penalty is the deterrent effect. In a 1985 study, published by economist Stephen K. Layson at the University of North Carolina, he found that every execution of a murderer deters, on average, 18 murders. The study also demonstrated that raising the number of death sentences by one percent would prevent 105 murders. However, …

…means that what one person has done to another should also be done to that person in return. Is that not justified, especially in cases of premeditated murder of another human begin, another life? Also, another point to consider is that today prison terms are not enough. Many people are allowed out early on parole and/or remission resulting in criminals just serving one third of their prison terms and being released back into society.