I generally agree with you, but I wouldn’t be quite that harsh. Our fire-bombing of Tokyo, Dresden, use of nuclear weapons, were immoral, but not all our strategic bombing was. We differed with the Royal Air Force in WWII, on that issue. I would disagree though that people would feel the same today or did by the late 20th century, as you suggest. While we still have a horrific but necessary, nuclear deterrent force, our weapons and how we use them, have become more precise and more moral, over the last 70 years. We now try exceedingly hard to never target non-combatants, we have become much better at targeting with much more accurate weapons. That does not mean that civilians are not still killed, but to bring it back to topic, Sherman was criticised for what people know is naturally wrong, to target those who are not combatants.