You also can't un-imprison someone. Sure, you can release him, but he'll never get those years back; his relationships will never be the same again; the trauma of imprisonment will never leave him.
I think the thing which needs to be done is to fix the judicial system: if we can't rely on it to correctly impose death, then we can't rely on it to correctly impose imprisonment. Maybe we need to incentivise prosecutors differently; maybe we need to conduct investigations differently; maybe we need to adjust the jury system.
Some people are against capital punishment in any case even if it is 100% painless and the judicial process is completely correct. I don't really have anything to say to them: it's obvious to me that there are certain crimes which absolutely merit that punishment and that to refrain from killing the guilty in that case is a profound injustice.
Well, a good thing is to not immediately cut off any possibility of reaching a common ground.
I think you describe the issue perfectly. Given an imperfect criminal justice system, how to you administer punishments?
Maybe the DA, the police involved, the judge, and every member of the jury should all be summarily executed in the case of wrongful conviction involving the death penalty? I can see some crimes that merit the death penalty, and if everyone involved had to risk their own life to apply it I would be more comfortable that it was not applied lightly because of racial/socioeconomic issues, police misconduct, or the political ambitions of a district attorney.
That's only the case if you believe in free will ideology. The injustice is "society" villainizing a person who had no control over their fate if you understand free will is an illusion because of determinism and how the brain functions.
Free will doesn't exist in society and similar to humans. The will of society is a summation of all the preceding forces upon generations and without any real control. The result being what we experience today as our society we live in.
This all is important to understand because hidden in it is the knowledge of why we have what we have now. Also the fact of how important the majority operates, behaves and thinks.
Currently, the majority thinks contrary to the fundamental truth of how their life will play out. I hypothesis if this wasn't the case, our society would adapt and because there is something similar to moral judgement.
Basically, the collective unconscious of society. The objective is made with effort of being positive, fair and right. That's assumed with how the majority believes the justice system we experience today is right and without understanding the true knowledge making it neither positive, fair or right.
The incorrect perspectives of how reality is,.. collectively prevents evolution of society and because the collective unconscious is still fixed upon incorrect beliefs. Thus, I think I'm sort of answering your question.