Perhaps you can explain why you think the concept that a life for a life is somehow alien to the Gospel. 

Perhaps you can explain why you think capital punishment is somehow contrary to the Gospel. You see, liberals and Pope Francis seem to think that all they have to do is state propositions without having to prove them.

Simply saying "Capital Punishment is opposed to the Gospel" does not make it so.

Why and how from your view is the death penalty opposed to the Gospel.