“The truth is, our Founders never claimed an unconditional “right” of independence at pleasure, meaning: for any reason or for no reason.”
There he goes again; writing about what the Founders didn’t write and ignoring what they did write when it does not line up with his mother church’s doctrines.
The Founders representing the 13 slave states did indeed say governments should not be changed for light and transient causes. The foundation of a new government must be organized - they said - in such a form “as to them shall seem most likely to effect their Safety and Happiness.”
The Confederates met the “as to them shall seem most likely to effect their Safety and Happiness” Declaration of Independence test.
Confederates failed the "light and transient causes" test, as well as several others.