Is Siege and Total War Okay?

I think it is not necessary to use Siege and total war because your killing innocent civilians and you don't know if they are even abolitionists or not. I do think that the tactic works because your breaking the whole city and eventually will burn almost all of the south and the union would win the war. The south kind of deserve it but not all of the south, just a little bit of it. Total war means to destroy all military resources and Siege is to cut off all supplies fro entering an area.