The Civil War was a great tragedy. To turn it into the evil Lincoln's victimization of the South is to distort the historical record and to diminish the tragedy.
But it was largely predictable and predicted. You can look up Webster's and Clay's warnings of what secession inevitably would mean -- war, destruction, and misery. There was no way to make unilateral secession at will work peacefully -- or if there was such a way, it wasn't the one the Confederates took.
Arguing over and over that secession was a constitutional right is like repeating over and over again that an experiment that always produces a given result ought to have a different one.
Secession at will wasn't constitutional and it wasn't a thing that could be made to work in our system -- or if it was, the people who attempted it weren't the kind of people who could make it work and they didn't approach dissolution of the union in a spirit that could have made it successful.