William L Craig seems to be the most vocal proponent of this idea, for example here:
The command to kill all the Canaanite peoples is jarring precisely because it seems so at odds with the portrait of Yahweh, Israel’s God, which is painted in the Hebrew Scriptures. Contrary to the vituperative rhetoric of someone like Richard Dawkins, the God of the Hebrew Bible is a God of justice, long-suffering, and compassion.I have discussed problems with divine command theory before, but there is another issue: How can we trust God?
According to the version of divine command ethics which I’ve defended, our moral duties are constituted by the commands of a holy and loving God. Since God doesn’t issue commands to Himself, He has no moral duties to fulfill. He is certainly not subject to the same moral obligations and prohibitions that we are. For example, I have no right to take an innocent life. For me to do so would be murder. But God has no such prohibition. He can give and take life as He chooses. We all recognize this when we accuse some authority who presumes to take life as "playing God." Human authorities arrogate to themselves rights which belong only to God. God is under no obligation whatsoever to extend my life for another second. If He wanted to strike me dead right now, that’s His prerogative.
What that implies is that God has the right to take the lives of the Canaanites when He sees fit. How long they live and when they die is up to Him.
If God is free to kill us when convenient, why should we imagine he is not free to lie to us when convenient?
Think about this. I imagine very very few of the people reading this have every killed anyone, but who can honestly say they have never told a lie? Lying is much easier than killing, much less of a wrong. If you admit God can kill whoever he wants, how can you possibly deny that God can likewise lie whenever he wants?
God lied in the Bible
Genesis 2:15 The Lord God took the man and put him in the Garden of Eden to work it and take care of it. 16 And the Lord God commanded the man, "You are free to eat from any tree in the garden; 17 but you must not eat from the tree of the knowledge of good and evil, for when you eat from it you will certainly die."Adam did not die when he ate the fruit (he did eventually die, but that was inevitable, only if he ate from the Tree of Life would he live forever). God lied to Adam (and the serpent told the truth!). Why should we believe God about anything?