Continued from yesterday
... Many Christians want to trump Jesus with the Old Testament, but there are two reasons why this is inappropriate. First, the judgment of the Old Testament falls in the category of God's action, not our orchestration. Paul says as much in the New Testament: "leave room for God’s wrath, for it is written: 'It is mine to avenge; I will repay'" (Rom. 12:19). In other words, it is not normally our business as individuals to administer judgment. 
The second is because the Old Testament understanding of things is sometimes incomplete without the New Testament. Indeed, even within the space of the Old Testament itself we sometimes find a development of how God operates or how Israel understands things. For example, prior to Israel's captivity in Babylon, God is "punishing the children for the sin of the parents to the third and fourth generation of those who hate me" (Deut. 5:9).
This pre-exile material has a sense of corporate guilt, such that the generation that the Babylonians destroy and take away is not actually the group of Israelites that did the sin. Thus Psalm 44:17 remarks that "All this came upon us, though we had not forgotten you; we had not been false to your covenant." Even though king Josiah is the most righteous king of Israel yet, his goodness does not counterbalance God's anger for the evil of his grandfather Manasseh (2 Kings 23:25-27).
If we find this sense of collective guilt difficult to fit with our Christian understanding of God, it is noteworthy that parts of the Old Testament itself had difficulty with it as well. Ezekiel 18 wrestles with Israel's destruction because of its parents' sins: "The parents eat sour grapes, and the children’s teeth are set on edge" (18:2). No longer, God says, will it work this way. Rather, from now on, "The one who sins is the one who will die" (18:4).
Christians who like the idea of God punishing all America because some group in America is doing wrong usually don't notice this passage or the similar passage in Jeremiah 31:29-30. Similarly, there is a real tension between the teaching of Jesus and anyone who would use parts of the Old Testament to support a lust for judgment on one's enemies.
What Jesus said was to "love your enemies and pray for those who persecute you" (Matt. 5:44). There's no wiggling out of it. If you don't like what Jesus says here, be honest about it. Don't pretend that Jesus said something different or try to use the Old Testament to trump Jesus. Any application of Scripture you use that tries to justify hatred of some person or group of people is simply not Christian. It's something else...
 That of course does not mean that there is not a place for governments to work for justice in the world, although such actions of governments are fraught with problems and prone to injustice themselves.