The only civil war in American history was literally decades in the making, arguably as far back as the Three-Fifths Compromise. A great deal of blood was shed long before 1861 ("Bloody Kansas" was not a term first used by a Brit complaining about the wind in Kansas), and the political in-fightning (which meant actual FIGHTING in some sessions of Congress) was long and protracted. John Brown raided Harper's Ferry with the fervent hope that fellow Free-Soilers would rise up and take arms in his support. He was mistaken, despite the fact that such tensions had been rising for years. It takes a short-sighted view of history to be believe that this nation is at "the tipping point", or that it is anywhere near another American Civil War.
Your post is instructive, but limited to an example of one. That seems to be a more short sighted view of history to me. We did not get to this point by virtue of the events since last November, or even four years before that. This has been a festering sore poked and prodded at since FDR.