As christians we are supposed to love our enemies "But I tell you, love your enemies, bless those who curse you, do good to those: who hate you, and pray for those who mistreat you and persecute you" Luke 6:27 and "Bless those who persecute you; bless and do not curse (Romans 12:14).....but howcome in many of the psalms we are praying for negative things to happen to our enemies, ex: wipe them out according to the abundance of their ungodliness (psalm 6), He shall return the evil things to my enemies; utterly wipe them out by Your truth psalm 53, But they vainly sought after my soul; they shall go into the lowest parts of the earth. They shall be delivered up to the hand of the sword; they shall be portions for foxes.psalm 62
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Second, This is mostly saying what God will do to our enemies not what we are doing to them.
Hope that helps.
In the world there is still a fight between good and evil, but he who uses the sword will be taken by it.
In the Old Testament, Pslams included, you find all the prophecies and symbols about Jesus Christ: the who, why, when, where, and all what He will do in the New Testament. He came and fulfilled everything.
One thing to be clear though is to avoid at all the misinterpretation of God's Love and Kindness as weakness, like the way people think when they deal together. God can "dissolve" all elements any time.