Psalms

The Psalms written by David seem to cover the gamut, inluding things which sound rather unsavory to our 21st-century American ears, like "Break the arms of these wicked, evil people! Go after them until the last one is destroyed." (Ps. 10:15) or "Slap all my enemies in the face! Shatter the teeth of the wicked!" (Ps. 3:7) Does this say something about God's character? Or does this say something about David's character? Or his view of God? Or his culture? Does this have any bearing on how we may/should talk to God? Is this sort of prayer disgusting? Or is it heartening? Or both?