If our goal is to kill Iraqi __civilians__ we have much better options to accomplish that goal. Don't forget all of the original justifications for the invasion were lies. Any non-militant death should weigh very heavy on American hearts, this was a war of choice in which we have killed enormous numbers of children, women and men who wanted nothing more than to live their lives in peace -- that is a loss not a win.
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How many of those people were completely innocent? By any reasonable measure we (the US) has killed far more innocent, blameless, just in the wrong place at the wrong time people in Iraq than we have lost to the "bad guys."