I'm neither pro or against capital punishment as both are flawed but how can their be no evidence? My thinking is if you are executed rightly or wrongly it's a bloody marvellous deterrent. Ive never heard of a corpse re offending but on the other hand just having looked at an article from 2007 (Telegraph). "30 convicted killers released from jail over the past 10 years have gone on to kill again, according to Home Office figures"
Clearly the loss of an innocent life is abhorrently wrong, alleged killer or victim. I don't know what the answer is but whatever it is it has to involve people who have killed not being free to commit the same crime.