In college and after, I read not only contemporary accounts of the Civil War and Southern history, but also older ones that have been forgotten or fallen into disfavor.
I graduated as a history major and was never taught the details - just nebulous "slavery slavery slavery" dogma. Nobody ever even mentioned tariffs, or where the federal government was getting the money it had or what it was spending the money on. Nobody ever mentioned the Corwin Amendment nor did anyone mention what a fringe group/how unpopular abolitionists were.
Even in law school, my con law professors got very squirrelly when it came to the passage of the 14th and 15th amendments as well as any mention of whether states had the right to unilaterally secede under the 9th and 10th amendments. Of course nobody mentioned the express reservations by multiple states of the right to unilaterally secede made at the time of their ratification of the Constitution.
I learned all of this afterward. It came as a great shock and a revelation to discover all the things that had never been taught to me. You know that William F. Buckley quote about Liberals....."they claim to be open minded and tolerant and willing to listen to the other side. Then they're shocked and offended to learn that there IS another side....." Well its the same here. Look how offended some get and how personally they take it to learn that there is another side....and not the other side that they expected....not slavery slavery slavery....but economics.
Look how they try to spin and contort themselves to explain away the numerous quotes from all sides made by people both before and during pointing out that the money is what was really driving things - just like it did in almost all conflicts throughout history. They're emotionally committed to the fantasy of this all being some grand morality play. They'll try to talk about the "Lost Cause" even when you've said nothing about it and every quote and source was from before and during - not after.
Deprogramming people who have been fed a narrative their whole lives is difficult. I saw it when I lived in Eastern Europe in the 1990s and you can see it in America today. Many people just can't accept that they've been fed outright lies and half truths all their lives.