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The political reasons for the war, which did certainly include slavery, though not solely slavery, often had nothing to do with the personal motivations of the men actually doing the fighting on either side.
For the men in the South who actually did the fighting, they saw it not as a war to defend slavery, but as a war to defend their own lives and their homes. The vast majority of them didn't have slaves, especially the men who were doing the fighting. They were not going to go take to the field of battle and die horrifically for the sake of defending some plant owner's right to own a slave. Doesn't make any sense.
What does motivate them is the perception that they are defending their own lives, their families' lives, and their home. This is the distinction that's very important for people to understand, and it's totally lost in the way that this subject is taught in schools and handled by the media and Hollywood going back decades.