Happy is the one who takes your babies and smashes them against the rocks! Psalms 137:9...and the bible is meant to be a standard for morality? [Spirituality & Religion]

[b]Just one more of the examples of brutal degeneracy lauded in the bible. With stuff like this, how can we take the bible as a guide for morality?[/b]

If "happy is the one" who smashes the babies of their enemies on rocks..what kind of morality is the bible offering us here?