This is my two cents worth, and I have not read past the OP:
The bible clearly allows government to use deadly force to protect its citizens. However when California voted on the death penalty several years ago, I voted against it. Not because it was unbiblical, because it is not, but because its administration many times was not just. Too many poor people, too many feeble minded, too many people of color were sentenced to death, but the rich, the well connected, the powerful somehow got off disproportionately. And I believe life without parole equally protects citizens.
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Interesting - the groups you selected as being over-representative in receiving the death penalty.
But there are over 2,000 prisoners on death row - yet only 51 are women. That is only 2% of all.
Therefore 98% of all Death Row are men. - Aren't you concerned that men are over representative on Death Row.