This is about the death penalty. A justice system is governed by humans, humans make mistakes, ergo you will always have some innocent persons who are found guilty and some guilty persons who are let go.
Even with all the safeguards built into the U.S. common law based justice system, you will always have a certain number of innocent persons who are sentenced to death, as this and other cases show.
You have to be willing to acept that IF you want the death penalty to be available as a sentence.
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