I’m just interested. The myths surrounding generals are often shakey. Like grant and the alcoholism. So did Sherman condone the civilian deaths?
This was a fascinating thing to search for. I will say straight-up that there has not yet been any answer directly examining Sherman's position on the matter.
But on your related matters, there is this exchange between u/buy_a_pork_bun and u/Rittermeister on the matter of civilian casualties during Sherman's March to the Sea. There is also u/johndeville's examination of the topic. Basically, the March to the Sea and the Rape of Nanking are not comparable.