Gordon Rhea's Why Non-Slaveholding Southerners Fought

This morning I was checking out some great Civil War links and I came across Gordon Rhea's January 25, 2011 address to the Charleston Library Society titled "Why Non-Slaveholding Southerners Fought". I have read his books on the Wilderness, Spotsylvania, North Anna and Cold Harbor. I found them well researched and joy to read. As I read the article, I found lots of reasons why the south left the Union but nothing as to why individual southerners fought. Maybe I'm splitting hairs but when I was in school we were taught U.S. involvement in Vietnam was to stop the spread of communism. When ever I've asked a Vietnam vet why they went, I have never heard the reply to "stop communism". I've gotten responses ranging from patriotic to "I had no choice; I was drafted". Letters and diaries from the civil war that I've read echo the responses from patriotic to "I was drafted". A better title might have been " Why Non-Slaveholding Southerners allowed Secession". This post isn't about "Lost Cause" defense. I get upset when every out house that burnt down between 1861-1865 in the deep south is attributed to Sherman. A friend summed it up well and I quote "I as a former soldier find this attitude disturbing as it seems to say that every soldier agrees with the government’s policy and is a willing participant in promoting that policy. "