People don't read about the savagery with which Sherman tore through South Carolina. Back in the '30s, Nazi propoganda commented on it as an example of what Germans would NOT do in wartime. The Federals blamed South Carolina for the war.
Not to mention that his concept of "The Union" having been perpetual was wrong and his calling up of 75,000 troops was unconstitutional. Lincoln, Stanton, Seward, Stevens - all political tools of the Northern industrialists.