Lincoln didn't believe your line of thought!
You support a man - without defending his reasoning's.Funny
I wouldn’t think someone who threw around the “Nazi” label and cruised crank sites like you linked would even know what “reason” is. Here’s a clue: reasoned arguments don’t start out with an Ad Hominum.
Lincoln clearly believed that unilateral secession, as attempted by the South, was not legal, and therefore fell under the parts of the Constitution dealing with insurrection. Whether he thought that the South had a Constitutional pathway that didn’t involved armed rebellion, I don’t know.
Regardless, the Constitutionally acceptable method for a State to leave the Union is spelled out in Texas v White. If you don’t like it, try seceding again, lose again, and take it to court again. Or pass an amendment, just like the folks who abolished Slavery and extended the Bill of Rights did. (p.s.: You can find out how to do that in the Constitution as well. Read it sometime.)