The Bible uses figurative and metaphorical language to show us the spiritual realities of the invisible world we cannot see; the figure exhibits the real; the physical reveals the spiritual. When the child of God asks the Lord to become the Enemy of his enemies and drive them away violently it is helpful to specifically know and name the enemy: it is the Devil, it is Death, it is Sin; it is even more helpful to identify the sin precisely, as we do in confession and daily repentance.
It is vital to remember that it is not the World, the people or the things in it, that is the real spiritual enemy that hates us and seeks to destroy the soul; then we have no qualms about asking God to be an enemy of my enemies and violently destroy them.
The figures of spiritual warfare employed in Psalm 35 are both military and legal. Jesus uses the words of verse 19, “My foes hate me without cause.” That’s how He got crucified. Jesus underwent human hatred to eliminate the curses hanging over me as a consequence of my sin. So I pray to God: “Say to my soul, ‘I am your salvation.'” (v. 3) And so I tell Sin and Satan!