The death penalty will always be executed with a certain false positive rate. Willing it as a form of punishment necessarily entails willing the death of innocent people, who crucially can’t be brought back in the event that the state realizes it was mistaken.
There are plenty of criticisms for the death penalty but now you're changing the goalposts as you realize your description written in a science fiction feel good reality was a bad fit.
Post one: The death penalty is always wrong because it can be handed out in error and cannot be revoked.
Post two: The death penalty is always wrong because it can be handed out in error and cannot be revoked.
No goalposts have changed in the making of this thread.