Comparing the two is a little silly to me. Mass genocide, killing about 11 million. One didn't. Other than the symbol they can't really be correlated. The civil war was also not about just slavery. I don't really care about what they do with the flag, I have no ties to it. The knee jerk reaction to take it down because of some nut job killing 9 innocent people seems silly to me though.
Yes, it was.
On Dec. 24, 1860, delegates at South Carolina’s secession convention adopted a “Declaration of the Immediate Causes Which Induce and Justify the Secession of South Carolina from the Federal Union.” It noted “an increasing hostility on the part of the non-slaveholding States to the institution of slavery” and protested that Northern states had failed to “fulfill their constitutional obligations” by interfering with the return of fugitive slaves to bondage. Slavery, not states’ rights, birthed the Civil War.
South Carolina was further upset that New York no longer allowed “slavery transit.” In the past, if Charleston gentry wanted to spend August in the Hamptons, they could bring their cook along. No longer — and South Carolina’s delegates were outraged. In addition, they objected that New England states let black men vote and tolerated abolitionist societies.
According to South Carolina, states should not have the right to let their citizens assemble and speak freely when what they said threatened slavery.
Other seceding states echoed South Carolina. “Our position is thoroughly identified with the institution of slavery — the greatest material interest of the world,” proclaimed Mississippi in its own secession declaration, passed Jan. 9, 1861. “Its labor supplies the product which constitutes by far the largest and most important portions of the commerce of the earth. . . . A blow at slavery is a blow at commerce and civilization.”
The South’s opposition to states’ rights is not surprising. Until the Civil War, Southern presidents and lawmakers had dominated the federal government. The people in power in Washington always oppose states’ rights. Doing so preserves their own.
Slavery was the root cause for secession and the war; Lincoln's election was simply the tipping point.