Of course God himself is the ultimate killer; the giver and taker of all life.
But, when it comes to a document of recorded history in which men write "We killed a bunch of people, because God told us to..."
I often wonder how much of the Bible was written by honestly inspired men, and how much was written by confused men who merely believed themselves to be honest and inspired, and how much was written by tyrants white-washing their own brutality.