Hear me out.
If we left the death row guys in prison, they are wasting a bunch of resources in the system. And our death penalty takes too long to get to them.
Wouldn't it make sense to let them all out now and then deal with them lethally on the streets, either through the police or deportations?
Just a thought.
You site the Old Testament in number one ... That is pre-Christ comming and therefore under the law. In fact, you did that for ALL of your examples.
We are now living under Grace and not a law that NO ONE can fully live up to.
As to the population issue? The entire world's population could be settled in the state of Texas, be given small yards around their homes, the state STILL WOULDN'T BE FULL.
Also, Jesus himself said for some any day is like any other and established the teaching that those living under grace can work on any day they want and that the Sabbath (historically Saturday, by the way) was made for man and not the other way around.
Your doctrine is off on so many counts. The greatest of the commandments is love, that we should love our neighbors, reach out to those in sin, and try to bring them out of sinful lifestyles.
Criminals should still be prosecuted according to the law, but the law should be tempered by the greater law of Grace that God has given us through the 'New and Greater Moses.'