General Washington hanged men for mutiny and for espionage. Was he therefore "barbaric"?
And what about those who profit wholesale from dangling the poison of life-destroying addictive drugs in front of confused and impressionable young people? I suppose you wouldn't consider that barbaric.
When Julius and Ethel R. handed off our nuclear secrets to the soviets, they handed them the means to murder every last one of us. That may not be "barbaric" enough for you, but in my view, it qualified them both for the death penalty.
"What you call "barely tolerable" or "barbaric" is not only approved but required by God Himself in Genesis 9:6. He not only requires it for murder but requires that murder penalty for all the generations. That means us."
No, it does not.