Q: How do you deal with the psalms that ask for the total destruction of various people?A: Most of these are psalms of David. David is speaking as more than just an individual. He is speaking as God subregent, i.e. vice king (vice president). To challenge or undermine David is to challenge God’s kingdom and people. God has and will judge people for their rebellion against Him.

See also:

Was Joshua Justified in Exterminating the Whole Population of Jericho?

A Christian Perspective of History

How can God condemn people who never heard of Jesus?