I think that it would straighten a lot of the criminals up and show them the consequences of what could happen to them. First, capital punishment is not justified by deterrence. In fact, statistics show that capital punishment can increase crime rates. Second, capital punishment is arbitrarily used, racially biased, and unfair in sentencing. I believe this is fully sanctioned by God, for He does not want his little children harmed in any way.
Some people make the decision to take the side of Satan.
Life is precious. God wants us to live in peace and fellowship. If we choose Satan's way, punishment is the only way to correct that choice. There are too many people spending their lives in prisons that should have already been executed because they cannot live freely among the people. I do not refer to the redeemable in prison.