One of the interesting takeaways from Victor Davis Hanson's book The Soul of Battle: From Ancient Times to the Present Day, How Three Great Liberators Vanquished Tyranny was not that the Greeks, South, and Germans were upset with (us, 2 out of 3 times) killing them, but with taking and breaking their stuff. I found that interesting.
Sherman is absolutely hated and despised in the South, but Grant killed far more (2-3x) southern boys then Sherman did in his little jaunt accross Georgia and the Carolinas. In fact, there were substanially fewer casualties (on both sides) then in normal battles.
While the Libs get all bent out shape about collateral damage (Trust me, I'm not for it, and am glad that we go way out of our way to prevent it.), it's really the taking and breaking that's far more damaging to our side, then the spilling and killing.