The only way I see the death penalty making any sense is if there were actually dangerous super villains in the world who seem to be able to escape from prison every few months.
maybe you (or anyone) can explain this...
let's take for example charles manson, or jeffrey dalmer, or that boston bomber kid, or whatever and whomever.
is it reasonable to assume that you (or whomever else) would feel that the crimes that these people have committed warrant life in prison without parole? do you think there is anything that could convince the general public that it's safe to allow them to freely rejoin society? i'm not asking if you personally are some tree-hugging hippie who can forgive anyone of anything, i'm asking if you think there's any possibility that society would collectively ever be OK with that.
based on what i understand of how humans think, the answer to that question is no - there is a class of act perpetrated which will singularly void the social contract, and negate an individual's privilege to exist within free society for the rest of their life. i guess argue that point if you disagree with it?
anyways, in that circumstance, i can conceive of absolutely no reason to keep them alive: just take them out of the courthouse to the back lawn and put a bullet or three in the back of their skull.
keeping them alive for absolutely no purpose is immeasurably more fucked up and morally depraved to me than to simply kill them.