It's massively, massively more complicated that that. To even begin to fully understand the Civil War and all of the movitations behind it, you pretty much have to study it exclusively at the post-graduate levels. Any position you could begin to dream up has been espoused authoritatively for a few decades, and the consequence is that there are generational and regional differences in education about the Civil War. E.g, Being a young Southerner, I was not taught the same thing that Darla, an old yankee, was taught. There are something like four or five distinct schools of thought on the Civil War; ranging from blatant revisionism to multi-faceted interpretations using later paradigms like Marxism and feminism.
I guess my point is really that everyone likes to use the Civil War to support their larger theories about why things occur the way they do. People in general just have to be careful trying to draw too many conclusions from limited information, particularly regarding the Civil War as it is immensely more complex than it appears to be in highschool textbooks.