Well, I'd argue there are crimes so heinous that nothing but the life of the murderer is truly justice. Certainly not them simply sitting in the cell for the rest of their life. Getting shelter and food courtesy of the state. And often today they don't spend life in prison but are paroled at some point.
That is a valid point, as well, but one could also argue that a man sentenced to death will live a pretty comfortable life sitting on death row exhausting his appeals. That's my second problem with capital punishment.
