Retribution is by definition "punishment for doing something wrong"(Websters). I have no problem with life imprisonment for first-degree murderers like Mr. Pfaff, provided that sentence is hard labor, no perks, nada, just hard unremitting 12 hour a day labor, on a rock pile in the baking sun, freezing rain,snow,  whatever. A gulag type existance, not so bad as to kill him but bad enough to where he just might wish he were dead.