Let me be clear that I'm not advocating for capital punishment at all, I'm staunchly against it. But honestly, if we're going to decide that we're allowed to kill people in the name of justice, it's arguable that the deceased's bodies should be used to help save lives.
Well, lots of things are arguable to some extent, but really the idea that the state should materially benefit from murdering its own citizens is pretty difficult to defend in my opinion. The moment a judge starts to think "well, what about all the lives this prisoner's healthy organs will save?" when deciding whether or not to give a death sentence, your society is 100% fucked. If anything your hypothetical society should deliberately not take the organs of any one sentenced to death.
