1. If mass incarceration worked, the US would be the safest country in the world. The US has 5% of the world population but 25% of the world's prisoners [1]. The US has the highest rate of incarceration of any country in the world [2];
3. Executing prisoners is really expensive. There have been a ton of studies on this. For example, Maryland estimates that each executed prisoners has a total cost of $3 million [3] once you factor in higher security incarceration and legal defense in appeals;
4. Since 1973, at least 195 people sentenced to die have been exonerated [4];
5. Death sentences are significantly more likely when the allegend offender is black and the victim is white [5]. The point is that this has almost nothing to do with "justice" and everything to do with anger and vengeance.
6. Of the people xonerated, 25% had confessed and 11% had plead guilty [6], both of which show massive problems with police practices and the difficulty, costs and risks in defending one's innocence.
Restorative justice is both cheaper and more effective at reducing crime. The biggest problem to solve is income inequality.
Unfrotunately, locking people up is big business. It creates jobs. Voncict labor is an unfortunate loophole in the Thirteenth Amendment otherwise banning slavery (eg [7]). Prisoners increase population without increasing the number of voters (sort of; it's a little complex). Prisoners are further milked through outrageous commissary fees, communication fees (leters and phone), medical co-pays and the failure to provide basic living conditions like sufficient food and medical care.
Mass incarceration and retributive justice have been an abject failure in the US. Spend a few minutes looking at Riker's Island. You may be tempted to call it an exception. You shouldn't. It's systemic. Retributive justice simply does not work so we need actual reform of this system.
[1]: https://www.aclu-wa.org/story/keys-our-mass-incarceration-cr...
[2]: https://www.prisonpolicy.org/profiles/US.html
[3]: https://www.supremecourt.gov/opinions/urls_cited/ot2016/16-5...
[4]: https://deathpenaltyinfo.org/policy-issues/innocence
[5]: https://innocenceproject.org/innocence-and-the-death-penalty...
[6]: https://innocenceproject.org/research-resources/
[7]: https://thecrimereport.org/2022/11/23/angola-will-remain-a-s...