On this issue, I agree with Pope Francis who leads the Catholic Church. Too many innocent people have been killed after being wrongly convicted and wrongly sentenced to the death penalty. On top of that, society does not have the right to take life to show that taking life is wrong. It is, to me, oxymoronic.
“Indeed, nowadays the death penalty is unacceptable, however grave the crime of the convicted person,” - Pope Francis
Pope Francis calls for world 'free of the death penalty'
I am not sure what you are asking, since there is a great difference between what a Christian is commanded to do, and what the Governments of this world must do.
Christians shouldn't be violent at all, according to Jesus (
Matt 5).
The primary purpose for any Government to exist is, to protect the citizens ... in fact, God keeps them in power specifically for this purpose (
Rom 13:1-7) .
Sometimes deadly force is necessary in that role.
Any person who demonstrates they are, and will be, a grave danger to innocent people around them, must be removed as a threat. And, they are authorized to do that in the least costly method, as stewards of public resources.
Also, the Government has the authority to make punishment a deterrent to crime. I am completely convinced, a person who has been executed will NOT repeat their offence. There is no greater deterrent than that.
And, I am completely convinced the Bible is correct;
Eccl 8:11 Because sentence against an evil work is not executed speedily, therefore the heart of the sons of men is fully set in them to do evil.
The current trend toward keeping the murderers in prison, 3 meals a day, room and board ... is NOT a speedy sentence.
I realize, the last few years have seen an increase in desperate men, committing hideous crimes, including as part of their plan "suicide by cop", and THAT kind of person is not only unaffected by the threat of death .... they are counting on it. But, if they could have been shot the instant they pulled THEIR gun out, think of the innocent lives saved!
Again, this is from the perspective of the GOVERNMENT'S responsibility/purpose ... not the Christian's.