Soldato
I would agree with you.....however, if it were my Son and Wife that was murdered, nothing on this earth would stop me from killing the person responsible.....and damn the consequences and morality of it.
Although, that is vengeance, I would have no interest in justice.
I think even the strongest opponents of the death penalty would be likely to act in the same way. I think I probably would as well.
As you say vengeance is what an individual craves in those circumstances not justice.
I have never heard an argument that has convinced me to support capital punishment. I can't view it as anything other than barbaric.