( Related Posting: Was the use of a measuring line literal or symbolic in 2 Samuel 8:2?

Related Posting: What are the Dangers of the Judgemental side of David’s life in the Bible?

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What deeper understanding can the bible reader get from the 2 Samuel 8:2’s account of how David killed off the defeated people of Moab? To elaborate, why does the David’s manner of killing off some of the people of Moab seem so arbitrary and/or playful in nature? There is No intelligent assessment, No thorough judicial process(No due process) from David. ( It’s Extrajudicial action)

2 Samuel 8:1-

Now after this it came about that David [a]defeated the
Philistines and subdued them; and David took [b]control of the chief
city from the hand of the Philistines.

2 He [c]defeated Moab, and measured them with the line, making them
lie down on the ground; and he measured two lines to put to death and
one full line to keep alive. And the Moabites became servants to
David, bringing tribute.

3 Then David [d]defeated Hadadezer, the son of Rehob king of Zobah, as
he went to restore his [e]rule at the [f]River…….