Answer:
no, because some defendants have been convicted purely based on circumstantial evidence, false eyewitness testimony, and false confessions as a result of pressurizing police interrogations. Furthermore, the courts assume that public defenders who have experience only in insurance and bank fraud type cases could handle capital cases and thus defendants on trial for murder receive poor legal counsel. Two Justices on the United States Supreme Court publicly admitted the pervasive inadequacy of appointed counsel in capital cases.
and capital punishment doesn't even deter crime. There is no credible evidence that the death penalty deters crime more effectively than long terms of imprisonment. States that have death penalty laws do not have lower crime rates or murder rates than states without such laws. ... The death penalty has no deterrent effect.
