Particularly given Democrat and Southern domination of the Senate and White House in the decades before the rebellion.
The "abuse" that was "intolerable" was the advent of a federal administration that was resolved in principle to treat slavery as a Constitutionally protected evil in the states where it existed, and to oppose it strenuously wherever state authority did not protect it. That was intolerable to the Slave Power.
People who depend on the parts of the D of I easily committed to memory are typically going to be surprised and chagrined when the record is a bit more fully explored. :)
They get out the Brasso and lovingly shine up their replica Great Seal of the CSA with George Washington's image, never realizing that he was perhaps the single most adamant proponent of UNION.
Walt