There is a class of people [in the South], men, women, and children, who must be killed or banished before you can hope for peace and order.
The United States has the right, and…the…power, to penetrate to every part of the national domain. We will remove and destroy every obstacle – if need be, take every life, every acre of land, every particle of property, everything that to us seems proper.
We are in our enemy’s country, and I act accordingly…the war will soon assume a turn to extermination not of soldiers alone, that is the least part of the trouble, but the people.
Seems he didn't care much for Indians either:
The more Indians we can kill this year, the less will have to be killed next year, for the more I see of these Indians, the more convinced I am that they all have to be killed or be maintained as a species of paupers.
"I myself have seen in Missouri, Kentucky, Tennessee, and Mississippi, hundreds and thousands of women and children fleeing from your armies and desperadoes, hungry and with bleeding feet. In Memphis, Vicksburg, and Mississippi, we fed thousands upon thousands of the families of rebel soldiers left on our hands, and whom we could not see starve. Now that war comes home to you, you feel very different. You deprecate its horrors, but did not feel them when you sent car-loads of soldiers and ammunition, and moulded shells and shot, to carry war into Kentucky and Tennessee, to desolate the homes of hundreds and thousands of good people who only asked to live in peace at their old homes and under the Government of their inheritance. But these comparisons are idle. I want peace, and believe it can only be reached through union and war, and I will ever conduct war with a view to perfect and early success."
"We cannot change the hearts of these people of the South but we can make war so terrible...make them so sick of war that generations will pass before they ever again appeal to it."
"It will be a physical impossibility to protect the roads, now that Hood, Forrest, Wheeler, and the whole batch of devils are turned loose without home or habitation. I think that Hood's movements indicate a diversion to the end of the Selma & Talledega road, at Blue Mountain, about 60 miles southwest of Rome, where he will threaten Kingston, Bridgeport, and Decatur,Alabama, I propose that we break up the railroad from Chattanooga forward, and that we strike out with our wagons for Midgeville, Millen, and Savannah. Until we can repopulate Georgia, it is useless for us to occupy it, but the utter destruction of its roads, houses, and people, will cripple their military resources. By attempting to hold the roads, we will lose a thousand men each month, and we will gain no result. I can make this march, and make Georgia howl! We have on hand over 8 thousand head of cattle and three million rations of bread, but no corn. We can find plenty of forage in the interior of the state."
"I make up my opinions from facts and reasoning, and not to suit any body but myself. If people don't like my opinions, it makes little difference as I don't solicit their opinions or votes."
"My aim, then, was to whip the rebels, to humble their pride, to follow them to their inmost recesses, and make them fear and dread us. Fear is the beginning of wisdom."
"I would make this war as severe as possible, and show no symptoms of tiring till the South begs for mercy."
So where, exactly, is Sherman wrong in any of them?