"So you shall put away the evil from Israel. And all the people shall hear and fear, and no longer act presumptuously." Deut. 17:12-13
I told you why it is not now. Did you read my post.
Because the sentence against an evil work is not executed speedily, therefore the heart of the sons of men is fully set in them to do evil. Eccl. 8:11
I don't see how you get "the death penalty is a reliable deterrent" from that passage.--->"So you shall put away the evil from Israel. And all the people shall hear and fear, and no longer act presumptuously." Deut. 17:12-13
There is many forms of punishment and many included death. If you can't see that, there is no use of me throwing my pearls in front of you anymore.(Mat. 7:6)
Christ’s apostles asked Him, "Do you know that the Pharisees were offended when they heard [Your] saying?" (Mat. 15:12). . How did Jesus respond? He said to ignore the complaints of the unbelievers: "Let them alone. They are blind," (Mat. 15:14).
God mocked the Midianites when He defeated them after sending a nightmare to them that they were being attacked by a loaf of bread (Jud. 7:13-14). Elijah, just prior to executing 450 prophets of Baal, "mocked them" as the Bible says, telling them to yell louder to their god so that Baal could hear their prayers since he was either on a trip, sleeping or in the restroom (Hebrew, "private place," 1 Ki. 18:27; and 2 Ki. 6:8-20).
God, however, does not condemn those who "rebuke the wicked" (see Prov. 24:25).
God mocked Jeroboam, who "stretched out his hand from the altar" and ordered the prophet arrested. "Then his hand, which he stretched out toward him, withered, so that he could not pull it back to himself" (1 Ki. 13:4). God mocked the Philistines when they found Dagon their god "fallen on its face before the ark of the Lord. So they took Dagon and set it in its place again" (1 Sam. 5:3). The next morning they found Dagon toppled again, but this time he had lost his head (1 Sam. 5:4). God mocked the idolaters who cut down a branch, and with half of it they make a god to worship and with the other half, they make a fire to cook lunch (Is. 44:14-17). Another carves an idol of stone and says to it "wake up" (Hab. 2:18-19).
When a harsh word is needed God uses a harsh word. This is true in the Old and New Testaments. Herod beheaded John the Baptist for "rebuking" the king for "all the evils which Herod had done" (Luke 3:19) and for condemning the tetrarch for incestuous adultery (Mat. 14:3-4; Mark 6:17-18; Lev. 18:16; 20:21) with "Herodias, his brother Philip’s wife" (Luke 3:19). Jesus warned of "the leaven of Herod" (Mark 8:15). When notified that "Herod wants to kill You," (Luke 13:31), Christ responded without respect, "Go, tell that fox, ‘I cast out demons’…" (Luke 13:32).
"The face of the Lord is against those who do evil" (Ps 34:16). God "loves righteousness and hate[s] wickedness (Ps. 45:7). There are six things "the Lord hates," including "a heart that devises wicked plans… a false witness who speaks lies, and one who sows discord among brethren" (Prov. 6:16-19). And God reminds us "All their wickedness is in Gilgal, for there I hated them. Because of the evil of their deeds I will drive them from My house; I will love them no more" (Ho 9:13). As Moses wrote of God, "if you do not obey Me... My soul shall abhor you" (Lev. 26:27-30).
"Every tongue which rises against you in judgment you shall condemn" (Isa. 54:17). Jesus taught that human beings will condemn the wicked. "The men of Nineveh will rise in the judgment with this generation and condemn it" (Mat. 12:41). Jesus said, "For God so loved the world." Then two verses later He added, "but he who does not believe is condemned already" (John 3:18). By today’s Christian standard, no unbeliever would know that he is condemned, because most believers will not communicate this vital truth. John 3:16 is nice. John 3:18 is not nice.
Jesus too said, "The men of Nineveh will rise in the judgment with this generation and condemn it..." (Mat. 12:41). And as Solomon wrote, "jealously is a husband's fury; therefore, he will not spare [the adulterer] in the day of vengeance. He will accept no recompense nor will he be appeased..." (Prov. 6:34-35). God gives the responsibility for vengeance, condemnation and judgment to His servants for "every tongue which rises against you in judgment you shall condemn. This is the heritage of the servants of the Lord…" (Isa. 54:17).