In terms of being "a mass murderer, a white supremacist" you neo-confederates should love the guy, after all your heroes are the likes of the founders of the KKK in the post Civil War era, the pro-Confederate, cowardly, murdering assassin of President Lincoln, plus of course the South's 'former' leading racial segregationists, such as the fire eating lunatic Edmund Ruffin, who did America a big favour by removing himself off the planet since he could not function without his slaves.
My bottom line is General Sherman was instrumental in defeating the biggest domestic threat to freedom in America during the mid 19th century, your hero's - the Confederate insurrectionists.
Let's face it, the way Sherman men torched the Cradle of Secession & Insurrection, (South Carolina), was a sight to see. Those massive cotton plantation manors were great for roasting marshmallows. "The Fiery Trail" (Orangeburgh and Columbia) was payback for that state's starting the Civil War.
"Boys this is old South Carolina, lets give her Hell"
In South Carolina cotton was just as much god as "King". Because of its large planter population and clout, South Carolina would require many slaves to keep the economy going. This would of course make the state a rabid defender of the institution of Slavery. South Carolina's upper class therefore became completely unwary of any attempt that might end the practice.
Since South Carolina was the first state to begin the secession of the Southern States and the first to "start the war" (by firing on Federal Fort Sumter), Sherman made South Carolina a focal point for payback plus. South Carolina in Sherman's eyes had brought forth civil war on the country. In Sherman's mind those Southern wealthy 'gentlemen' from the planter states had used their paranoia to bring forth a war that had torn apart his nation and killed hundreds of thousands of his country men.
"General Sherman's army passed through this place. We will fight until every rebel is slain unless they will lay down their arms and come back in to the Union under the old Constitution. South Carolina was the root of Secession. The south are to blame for this war and none others. Why did not the Southern States wait and see whether A. Lincoln would interfere with slavery before they seceded." A federal Solider's words left in a court clerk's office in Bennetsville, SC.
"South Carolina cried out the first for war and she shall have it to her hearts content. She sowed the wind and she shall reap the whirlwind". An Iowa soldier at Savannah.
"One thing for certain S Carolina is about to feel the Iron Hand of War placed on her and it will be no gentle manner, all soldiers know that it was the birth place of dark treason and we will make it the death place of some Traitors". Illinois Cavalry trooper.
"I have never burnt a house down yet, but if we go into South Carolina I will burn some down if I can get the chance." Federal soldier
"The thousands of homes she has filled with mourning, the unnumbered hearts she has wrung with anguish, are all witnesses of the justice of her punishment. Let her drink the cup she has brewed, and lie on the bed she has made." A federal Chaplain regarding South Carolina.
"I suppose; in fact I know, that in the course of this army in South Carolina will be severely condemned by many in the North. If you hear any condemning us for what we have done, tell them for me and for Sherman's army, that 'we found here the authors of all the calamities that have befallen this nation and the men and women whose hands are red with all the innocent blood that has been shed in this war, and that their punishment is light when compared with what justice demanded." Ohio Officer in Sherman's army
"Today commences the destruction of SC and we gave her a good initiation". Wisconsin officer
Sherman's March to the Sea was a reward for his brave troops since at the end of the glorious March was a day at the beach :)
"You Cannot judge war in Harsher terms then I will. War is Cruelty and you cannot refine it, and those who brought war into our country deserve all the curses and maledictions a people can pour out." Union General William Tecumseh Sherman
"South Carolina is reaping at last the consequence of her treason..." George W. Pepper, speaking of the Burning of Columbia, South Carolina.
I would tell you to go fly a kite, but in your case the banner of rebellion will do.