No mistaken sentences are "acceptable" in a naive sense. But a death sentence, after it's been executed, is 100% irreversible. A prison sentence is reversible

No mistaken sentences are "acceptable" in a naive sense. But a death sentence, after it's been executed, is 100% irreversible. A prison sentence is reversible in the sense that the individual could be released; sure, the time lost cannot be retrieved, but the individual is still alive.