From Terence Frethiem’s God and Violence in the Old Testament:
Remarkable correspondences exist between God’s actions and those of Nebuchadnezzar. God will not “pity, spare, or have compassion” (Jer 13:14), because that is what the Babylonians, the instruments of divine judgment, will not do (Jer 21:7; see 27:8). The violent words/deeds appear to be used for God because they are used for the actions of those in and through whom God mediates judgment; the latter will certainly act as kings and armies in that world are known to act. The portrayals of God’s wrath and violent action are conformed to the means that God uses. God thereby accepts any fallout that may accrue to the divine reputation.