You Should Have Doubts.

Judges like Judge Posner, one of the most famous sitting U.S. Court of Appeals judges, feels that the death penalty is a powerful deterrent and that virtually no one innocent is executed. Given the fact that about 10% of death row inmates are ultimately exonerated, and that another 20% or so ultimately have their sentences commuted to less than a death sentence, your confidence should be less sound.

Read the story of Luis Rameriz who was excuted this past October on flimsy evidence, and you should wonder how we can possibly stick to our existing system of capital punishment.