P1: Murder is immoral
P2: Convicted criminals are not always guilty
P3: Life is preferable to death
C: The death penalty is immoral and is not preferable to life in prison
Killing an innocent person, which is a risk with the death penalty, is by definition murder.
Back when my Mawmaw was alive (that is Arkansas for Grandma), when she would see a news story about someone that had done something like this guy and raped and killed a pregnant woman, she should just say: "Some people just need a killin." I agree.
"You're the only person that decides how far you'll go and what you're capable of." - Ben Saunders (Explorer and Endurance Athlete)
As a society we decided long ago that we sanction some civil killing. (I exclude warfare, an entirely different discussion.) When pro-choice prevailed over pro-life that milestone was passed. We decided we could live with the destruction of some human life in order to accomplish something else we deemed worth the sacrifice. For the record, I'm pro-choice; I understand why we condone abortion. Having justified en bloc the killing of assuredly innocent fetuses, there can be no claim on behalf of convicted criminals, whose death-worthiness, as a calculated matter, is nearly infinitely greater. Put most plainly, we do not hold life sacred. I'm fine with that, and I decline to indulge in a hypocritical fudge factor on behalf of shallow sentimentalism.
"It's always reassuring to find you've made the right enemies." -- William J. Donovan