Israel was used as an instrument of God's wrath and justice against those in the promised land. Also God was making His Name great amongst the nations, amongst all the inhabitants who had forgotten their Creator and whored after demons who were no gods at all.
Speaking to Abraham concerning Israel God said:
Genesis 15:16
In the fourth generation your descendants will come back here, for the sin of the Amorites has not yet reached its full measure."
Moses speaking to Israel before they went in to posses the land concerning the sin of the inhabitants said:
Deuteronomy 18
9 When thou art come into the land which the Lord thy God giveth thee, thou shalt not learn to do after the abominations of those nations.
10 There shall not be found among you any one that maketh his son or his daughter to pass through the fire, or that useth divination, or an observer of times, or an enchanter, or a witch.
11 Or a charmer, or a consulter with familiar spirits, or a wizard, or a necromancer.
12 For all that do these things are an abomination unto the Lord: and because of these abominations the Lord thy God doth drive them out from before thee.
Concerning the Lord's Namesake:
Deuteronomy 28
The Lord will grant that the enemies who rise up against you will be defeated before you. They will come at you from one direction but flee from you in seven.
8The Lord will send a blessing on your barns and on everything you put your hand to. The Lord your God will bless you in the land he is giving you.
9The Lord will establish you as his holy people, as he promised you on oath, if you keep the commands of the Lord your God and walk in obedience to him.
10Then all the peoples on earth will see that you are called by the name of the Lord, and they will fear you.
Now concerning Christ's commission to love your enemy, it is clear and explicit...
43 “You have heard that it was said, ‘You shall love your neighbor and hate your enemy.’ 44 But I say to you, love your enemies and pray for those who persecute you, 45 so that you may be sons of your Father who is in heaven; for He causes His sun to rise on the evil and the good, and sends rain on the righteous and the unrighteous. 46 For if you love those who love you, what reward do you have? Do not even the tax collectors do the same? 47 If you greet only your brothers, what more are you doing than others? Do not even the Gentiles do the same? 48 Therefore you are to be perfect, as your heavenly Father is perfect.
Is God not gracious and long-suffering? Is God not both just and merciful? We must remember we are the creature subject to God, not the other way around. If it is that God calls us to bring about justice, like police officers or other civil servants, we are called within God's providence and sovereignty. Yet within this we are continually called to love our enemy, just as God loved us as while we were enemies of His, He sent His only begotten Son to die for our sakes.
Atheists are enemies of God, even hostile to God, yet I continually pray they turn from their unbelief. Jews and Muslims are enemies of the cross, yet I pray they see the truth that is in Christ. Buddhists teach a doctrine contrary to that of Jesus, Hindus worship the demonic, and still I pray the light of the gospel releases them from their bondage. The Way is not the way of the world, it is holy.