I appreciate your exposition on scripture and capital punishment. Interestingly, had your analysis concluded that capital punishment is not allowed under biblical teachings, it would have been coopted by the liberals, despite their normal insistence on separation of church and state. Since the libs do claim this separation, and since this separation has infested most of the rest of government, including our legal system, our analysis should be done only the basis of logic and objectivity, and not what the left would under any other circumstances label as blind faith on a "crutch" of a God.
In my personal life I adhere to Christ's teachings, or at least I try to. But this is a government and governmental justice, which cannot be influenced by religion in selected applications, while ignoring it in all others.
The day the leftist relativists stop attempting to use their subjective "moral" arguments for why we shouldn't have capital punishment, thats the day when I won't use the absolute (objective) standard for morality (that our constitution guards), to rebut them.
It isn't just death that the anti-capital punishment crowd object to. Since "society" is ultimately to blame for everything, they have a problem with significant punishment of any kind. If they win on the death penalty, we'll soon see a campaign to reduce sentences, esp. "life without parole" as this, too, is cruel and unusual.