1 Samuel 15:18: Completely Destroy Them!
A chief objection to the view that the God of the Old Testament is a God of love and mercy is the divine command to exterminate all the men, women and children belonging to the seven or eight Canaanite nations. How could God approve of blanket destruction, of the genocide of an entire group of people?
Attempts to tone down the command or to mitigate its stark reality fail from the start. God's instructions are too clear, and too many texts speak of consigning whole populations to destruction: Exodus 23:32-33; 34:11-16; and Deuteronomy 7:1-5; 20:16-18.
In most of these situations, a distinctive Old Testament concept known as herem is present. It means "curse," "that which stood under the ban" or "that which was dedicated to destruction." The root idea of this term was "separation"; however, this situation was not the positive concept of sanctification in which someone or something was set aside for the service and glory of God. This was the opposite side of the same coin: to set aside or separate for destruction.
God dedicated these things or persons to destruction because they violently and steadfastly impeded or opposed his work over a long period of time. This "dedication to destruction" was not used frequently in the Old Testament. It was reserved for the spoils of southern Canaan (Num 21:2-3), Jericho (Josh 6:21), Ai (Josh 8:26), Makedah (Josh 10:28) and Hazor (Josh 11:11).
In a most amazing prediction, Abraham was told that his descendants would be exiled and mistreated for four hundred years (in round numbers for 430 years) before God would lead them out of that country. The reason for so long a delay, Genesis 15:13-16 explains, was that "the sin of the Amorites [the Canaanites] has not yet reached its full measure." Thus, God waited for centuries while the Amalekites and those other Canaanite groups slowly filled up their own cups of condemnation by their sinful behavior. God never acted precipitously against them; his grace and mercy waited to see if they would repent and turn from their headlong plummet into self-destruction.
Not that the conquering Israelites were without sin. Deuteronomy 9:5 makes that clear to the Israelites: "It is not because of your righteousness or your integrity that you are going in to take possession of their land; but on account of the wickedness of these nations."
These nations were cut off to prevent the corruption of Israel and the rest of the world (Deut 20:16-18). When a nation starts burning children as a gift to the gods (Lev 18:21) and practices sodomy, bestiality and all sorts of loath-some vices (Lev 18:25, 27-30), the day of God's grace and mercy has begun to run out.
Just as surgeons do not hesitate to amputate a gangrenous limb, even if they cannot help cutting off some healthy flesh, so God must do the same. This is not doing evil that good may come; it is removing the cancer that could infect all of society and eventually destroy the remaining good.
God could have used pestilence, hurricanes, famine, diseases or anything else he wanted. In this case he chose to use Israel to reveal his power, but the charge of cruelty against God is no more deserved in this case than it is in the general order of things in the world where all of these same calamities happen.
In the providential acts of life, it is understood that individuals share in the life of their families and nations. As a result we as individuals participate both in our families' and nations' rewards and in their punishments. Naturally this will involve some so-called innocent people; however, even that argument involves us in a claim to omniscience which we do not possess. If the women and children had been spared in those profane Canaanite nations, how long would it have been before a fresh crop of adults would emerge just like their pagan predecessors?
Why was God so opposed to the Amalekites? When the Israelites were struggling through the desert toward Canaan, the Amalekites picked off the weak, sick and elderly at the end of the line of marchers and brutally murdered these stragglers. Warned Moses, "Remember what the Amalekites did to you along the way when you came out of Egypt. When you were weary and worn out, they met you on your journey and cut off all who were lagging behind; they had no fear of God" (Deut 25:17-18).
Some commentators note that the Amalekites were not merely plundering or disputing who owned what territories; they were attacking God's chosen people to discredit the living God. Some trace the Amalekites' adamant hostility all through the Old Testament, including the most savage butchery of all in Haman's proclamation that all Jews throughout the Persian Empire could be massacred on a certain day (Esther 3:8-11). Many make a case that Haman was an Amalekite. His actions then would ultimately reveal this nation's deep hatred for God, manifested toward the people through whom God had chosen to bless the whole world.
In Numbers 25:16-18 and 31:1-18 Israel was also told to conduct a war of extermination against all in Midian, with the exception of the prepubescent girls, because the Midianites had led them into idolatry and immorality. It was not contact with foreigners per se that was the problem, but the threat to Israel's relationship with the Lord. The divine command, therefore, was to break Midian's strength by killing all the male children and also the women who had slept with a man and who could still become mothers.
The texts of Deuteronomy 2:34; 3:6; 7:1-2 and Psalm 106:34 are further examples of the principle of herem, dedicating the residents of Canaan to total destruction as an involuntary offering to God.