I agree. Mistakes are going to happen at some rate, 4% seems realistic. At least if the wrongfully-convicted person is still alive in prison, they can be releas

I agree. Mistakes are going to happen at some rate, 4% seems realistic. At least if the wrongfully-convicted person is still alive in prison, they can be released and compensated. They may be able to bring a civil suit if there was sufficient malfeasance or incompetence. Some redress can happen. As well, once someone has been executed, interest in finding the truth goes away, and any chance to correct and improve the system based on that case's specifics is gone.