For Old Testament translations it's wise to go to the source.
It's widely believed that the Ten Commandments were taken from a remarkably similar list in the Egyptian *Book of the Dead* which commands "Do not murder".
(To address the other point here, Miller is no wuss.)
And going to the 'source' I can see the argument very well that ratsach would include any killing depending on the cause of the war (whether or not the action was in self-defenst)