Great point. This is the part where if a Christian begins arguing that it does warrant death, you quote about turning the other cheek - but unfortunately those discussions aren't ones that either side wins, no matter how well you know your Bible.
I had the conversation that spawned this post with a devout christian. My response wasn't about turning the other check, but about the adulteress that was about to be stoned. There was a circle of men around her, prepared to stone her for adultery. Jesus stepped in (like the bad ass motherfucker that he was) and said, "let ye without sin cast the first stone." -I said the to the guy I was talking with that if he wanted to kill people as punishment, first he needed to find someone without sin to pull the lever. crickets.....