The proper exegetical principle is this: Mosaic law is still to be enforced, by the church or the State or both, unless there is a specific injunction to the contrary in the New Testament.
When men see how relevant the ten commandments are for economics, they should gain new respect for the importance of the laws of God for all of life, but especially for the life of dominion man, the man redeemed by grace through faith in the one true Dominion Man, Jesus Christ.
The negative penalties of the Old Testament case laws were not harsh but just, not a threat to society but rather the necessary judicial foundation of civic freedom… the Old Testament was harsh on criminals because it was soft on victims.