I do understand peoples view for not having it and the eye for an eye analogy.
I think we all have a case in mind whereby the fact it happened is in no doubt whatsoever and will never be proved wrong. The killing of lee rigby for example or Ian Huntley or Harold shipman.
Would the death penalty serve as a deterrent? Probably not.
Will they ever be released? Probably not
Is it more cost effective to keep them in jail for all of their lives than to kill them? I don’t know enough but as above posted saying it is.
But I ask myself, do these people deserve to live, to taste food, to communicate with their family, to watch tv, to read books, to sleep peacefully on a mattress and in warmth, to imagine places and thoughts and listen to music? And I always answer No they do not.