Regardless, I think equating capital punishment with ritual sacrifice is a fair judgement. No matter how rational our rituals and systems for killing people seem, there's no reason to suggest that the Aztecs did not feel similarly about their rituals and systems. Law is not supposed to be a science, so it's also not free from cultural relativism, even if you're not a cultural relativist generally.
Given the advanced bureaucratic practices common to empires in precolonial America, it seems the Aztecs simply required regular sacrificial deaths (via suicide or homicide) to maintain their office, in addition to regularly liquifying prisoners or the enslaved. Like a death camp which ran on self-motivated suicide, for reasons of cosmic accounting.
Personally I find 5DFractalTetris' claims to be preposterous and wrong, but IMHO downvotes should be reserved for something other than "I disagree with this comment."
I have to agree just a shade with the premise.
A lot of punishment is morally oriented, and it's derived from our value system which is headed by 'God', or at least an interpretation of that.
Murderers are executed not just to keep them off the streets, but as a matter of punishment which is fundamentally pleasing to our moral code ... headed by God.
I think old-school capital punishment is at least distantly related to the concept of sacrifice.
Though I wouldn't want to equate the two.