As with most wars, there were many causes. “Abolitionism” was one of them. The “Tariff of Abominations” was another.
The "Tariff of Abominations" was 30 years before the Civil War, and even then, the only state that considered it abdominal was South Carolina. The rest of the South was not all that upset about it and certainly not upset enough to consider nullification or disunion as South Carolina did.
The war was started by the slave power as it existed in 1860. They had many faults but abolitionism is not one that I have ever heard them accused of.
They could also not be accused of supporting the tariff of abominations, which was passed back in about 1830, unless you have evidence of a time machine.