Nice article, even if it is a bit lengthy. This topic offers many facets for further discussion. For example, I live in the Chicago area. The political machine here is notorius for pinning guilt on the wrong person and sentencing an innocent person to death. In short, a corrupt government is a poor dispenser of capital justice. This is one argument for minimizing or eliminating capital punishment.
In the beginning, rather in the Old Testament, capital punishment was declared in the law, given to the people and used regularly. Why should we place a ban on it now. You can offer the point, we have advanced as a civilization and society to the degree that incarceration is the right choice. Have we really advanced though.