Good historians do much more than show historical events as a photograph. History is about people doing things, not just a cataloging of res gestae, things done. As a result, good history must explain what it is that the people involved in the historical event were thinking and feeling as well as what they did. Good history explains what problems the historical actors needed to solve. Good history then proceeds to explain what process(es) the actors used to come to a decision about how to resolve those problems. As the historian makes these points clear, good history goes on to explain/describe the actions taken to bring the problems to resolution.
(While my exposition implies that the process of portraying the contents of good history is linear, the actual exposition by the historian need not be so. One could easily report on what happened and then do the causal explanation of why the historical agent(s) felt compelled to act in the way described. This is a question of style rather than a question of necessary and sufficient content.)
In the sense that I have just described it, good history includes portrayals that are akin to both good art and to good scientific exposition. I suspect that the PBS piece is somewhere in the middle of the spectrum between good history and bad history. The PBS piece is also, first and foremost, entertainment.
I suspect you may well be right. What I see as operative here is the real point of Sherman's famous dictum, "War is hell." No war is good, in the sense that what happens in war is pretty horrific. However, some wars are "right" to fight and are, in that sense, good. The distinction is between why one fights and how one fights. I suspect that Sherman was focused on the actions subsequent to the declaration of war, which are indeed terrible.
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