Believe me Carl, I am with you on the broad strokes. I have no objection to capital punishment, as I see it as a balance of justice. Ruin a life, forfeit your own. This for that, in equal measure. It's not revenge, but paying the bill, protecting society, and hopefully dissuading other would-be offenders.
However, the severing of a hand doesn't make sense to me. It does seem cruel. It also makes a person a burden and severely limits his or her ability to perform basic functions of life, let alone who knows what it will do to someone psychologically. Is a recidivist violent offender really someone we want to cripple and then put back out in the world, who now possibly feels they have nothing left to lose?? I, for one, do not want to walk amidst such potentially hateful and vengeful spirits.
Violent crime inherently threatens the lives of the victims. Just because a mugger got lucky, and the victim complied at gunpoint doesn't mean the mugger has not viewed the life of another with such absolute disregard that may have resulted in death. I think if something so severe as cutting off an essential limb is "justified", then, so is capital punishment. However, I do believe in mercy even then, in the form of a grace period before execution, in order to give the convict time to at least seek contrition and metaphysical redemption before the sentence is carried out.