A majority of people labor under the misconception that the purpose of the war was to end slavery. It wasn't. That "purpose" didn't get added to the war until a year and a half into it. For the first year and a half the intent was to keep slavery just as it was.
Slavery would have eventually attritted away, but it would have taken at least another 20 years, and possibly 80 more years.
It would have still been a better solution to let it die naturally than kill so many people and destroy so many other people's lives.
The modern justification for all of the bad things that were done in the Civil War is slavery.
It is for that reason that I address the bad things that were done in the Civil War by addressing how slavery could have been ended a different way.