Here I have a good question for you. Let's say their is this man who commited a murder(s) and he is POSSIBLY bloodthirsty crazy. Would you prefer him to be life in jail OR killed at the spot?
My answer would be killed at the spot. Too many times have criminals who people THINK they have changed which they do not, go on parol or get bailed out by their lawyers. Anyone else got an answer?
If a person takes innocent person's life intentionally and he is proven guilty. His life should be taken as a consequence of his action . This will discourage any other person who have thought of murder in his head. Besides i'm sure a bullet will cost far less than life imprisonment and a sword will even cost less than a bullet (in long run).
I said it will discourage, not that it will just stop it at once. There are many sick Basterds who dont value their own life and who deserve to b killed and with the implementation of death penalty only they will b the only murderers left(or atleast a majority .