The thing about the Bible is that it's just not very good. Random people on the internet say wiser things every day. Give me one helpful pointer in the Bible and you'll find yourself adjusting it a bit from the actual text because as far as being good goes, the Bible is not.
What about Psalm 137:8-9? 8Daughter Babylon, doomed to destruction,
happy is the one who repays you
according to what you have done to us.
9Happy is the one who seizes your infants
and dashes them against the rocks.