Yes. fear. Fear of the Black majority in SC, and the possible lack of safety in a Union controlled by a Republican C-in-C. Of course, SC would not have attempted such a move had it not been reasonably sure it would not be alone.SC left the union because of fear? So they left because they were safer in the union then out of it? Why isn't this registering? Could it be because of slavery mythology, that the war was all about slavery instead of real estate? The explanation that it was all about slavery is the true lost cause argument.