Charles Spurgeon Commentary Jeremiah 10:25

"Pour out thy wrath upon the nations that know thee not, and upon the families that call not on thy name: for they have devoured Jacob, yea, they have devoured him and consumed him, and have laid waste his habitation." — Jeremiah 10:25 (ASV)

So he asks God, instead of smiting his own children, to smite his enemies, and knowing what we do about the Babylonians, we do not wonder that Jeremiah offered such a prayer.