For me personally, 0 is the only acceptable number. The only way to get that is to end the death penalty.
But why? Surely you must acknowledge that the "innocent people murdered by the state rate" is inversely proportional to the "innocent people murdered by criminals who should have been put to death but weren't rate"? This latter rate includes prison murders, calling/paying for hits from prison, influencing copycat killers, being released and then killing again, etc.
So basically you are trading one form of innocent death for another (not to mention introducing a host of other negative effects to society by allowing truly evil people to interact with people in said society). For me, death penalty is acceptable as long as the "innocent people murdered by the state rate" is less than the "innocent people murdered by criminals who should have been put to death but weren't rate".
> Our prison system is barbaric and the solution isn't to just kill all criminals
I never said it was. I think DP should be reserved for organized crime leaders, serial killers, and other people who have repeatedly shown that they are fundamentally incompatible with a good society.
A crime of passion such as a husband killing the man cheating with his wife does not necessarily deserve DP and would be a candidate for reform.
To be in favor of the death penalty is to accept the possibility of abuse, something we've seen occur where people are rushed to death row before their criminality can be fully presumed.
The death penalty should never be on the table because the possibility of abuse is too high and the history of it being abused proves that it can't be handled in any rational way.
I think the reversibility argument is a sloppy way of trying to say that there is some massive difference in kind between a lifetime of imprisonment and an execution. The argument seems to be implying that outright ending a human life is taking infinite value, but imprisoning someone for an entire lifespan is taking only finite value. That's the only way it would make sense to allow for the possibility of some erroneous lifetime imprisonments, but not allow for the possibility of some erroneous executions.
Secondly, and I'm sorry, but your characterization is incredibly sloppy. The overall outcome is better if even one exoneration happens and you assume equal preference for life imprisonment vs execution. However:
* Many wrongful convictions will be exonerated. There are multiple per year. There has been at least one this year: https://deathpenaltyinfo.org/innocence-cases#CliffordWilliam...
* Further, while the preference might not be "infinite" you can just look at the overwhelming majority - innocent or not - of death row prisoners that exhaust all avenues of appeal to see that there is a strong preference there.
Secondly, of course I don’t dispute that there’s generally a preference for life imprisonment over execution.
From the perspective of the - potentially falsely - accused, "The difference is that you’re still alive" is a pretty fundamental distinction and "The finality of imprisonment and execution are the same" is false.