Absolutely right. Can you call Sheridan or Sherman immoral for following orders issued by Grant. This point is provable. They had written instructions to carry the war to the populace. Grant could not have issued the order without War Dept approval, Stanton and Lincoln. The Granery of the Shenandohah Valley is what Lee used to subsist his army. Therefore, it was a legitimate target.
Same with Georgia and it's industry, salt, leather tanning, etc. Sherman and Sheridan were not megalomaniacal men bent on destruction. They were men who thought like Grant and therefore able to follow his orders. Soldiers only.