Dear Kenneth, look back at your post and notice how now no scripture was given at all. You may as well claim that there is no Lake of Fire because God is love.
I think if you reconsider this issue, you may change your mind.
Where does the NT say not to execute murderers? Last time I looked Romans 13 was NT. (The government minister of God, bears not the sword in vain.) The Lord approves the sword -- and not just to tickle people with.
OT? From Adam to the flood was OT, and apparently there was no capital punishment -- in fact Cain, the murderer, got a special protection being put to death.
At the Flood (OT) almost everyone was executed -- by the Lord.
After the Flood, a new dispensation was instituted: it included captial punishment. Men were not asked to but ordered to execute murderes. This is long before the Law, and ordered by a gracious, loving God.
Every moving thing that liveth shall be food for you; as the green herb have I given you all. But flesh with the life thereof, which is the blood thereof, shall ye not eat. "And surely your blood, the blood of your lives, will I require; at the hand of every beast will I require it; and at the hand of man, even at the hand of every man’s brother, will I require the life of man. Whoso sheddeth man’s blood, by man shall his blood be shed: for in the image of God made he man. And you, be ye fruitful, and multiply; bring forth abundantly in the earth, and multiply therein.
"And God spake unto Noah, and to his sons with him, saying, And I, behold, I establish my covenant with you, and with your seed after you; and with every living creature that is with you, the birds, the cattle, and every beast of the earth with you; of all that go out of the ark, even every beast of the earth. And I will establish my covenant with you; neither shall all flesh be cut off any more by the waters of the flood; neither shall there any more be a flood to destroy the earth. And God said, This is the token of the covenant which I make between me and you and every living creature that is with you, for perpetual generations. I do set my bow in the cloud, and it shall be for a token of a covenant between me and the earth. And it shall come to pass, when I bring a cloud over the earth, that the bow shall be seen in the cloud, and I will remember my covenant, which is between me and you and every living creature of all flesh; and the waters shall no more become a flood to destroy all flesh. And the bow shall be in the cloud; and I will look upon it, that I may remember the everlasting covenant between God and every living creature of all flesh that is upon the earth. And God said unto Noah, This is the token of the covenant which I have established between me and all flesh that is upon the earth.
There is nothing about the Noahic Covenant & Dispensation that is temporary. It certainly lasts as long as the Rainbow appears. The Rainbow continues with God's promise not the destroy the earth again with a flood. Nowhere is the Noahic Dispensation nullified or ended in the Bible. The rules of it continue over and with the Abrahamic Covenant, the Mosaic Covenant, and Church Age. We still eat meat & are secure from the Flood.
It is gross disobedience for man to refuse to execute murderers. Being made in the image of God justifies man being an executioner -- judges are called "gods" in the Bible; they act as God's representatives.