Your legal rights argument is flawed in a couple of ways.
1) The Hartford Convention was during the Presidency of Monroe not Jefferson. Furthermore the Hartford Convenion never adopted a platform of secession and its proceedings were in secret thus preventing us from really knowing what happened in there.
2) Why do you accept Jefferson's Kentucky Resolution as legal fact? Madison's Virginia Resolution was released at about the same time and he later stated that the Virginia Resolution was not meant to construe that secession was a remedy. He in fact denied secession.
3) Madison's letter to Webster in 1833 proves that "the founders" did not believe in secession. Perhaps some did but others did not.
4) Of course they did not believe in an all powerful national government, but at the same time they did not beleive in a pitifully weak national government that could be overruled whenever by the states.
Lincoln attacked?
And if you are only using the word "disastorous" in terms of physical destruction than I have no quarrell. If you are using that word in terms of results though we will quibble.
If you want to blame a man for living in his time than do so. The policy of colonizaion was much more progressive than the policy of slavery and had a long history with many notable supporters. More importantly, LIncoln had begun to drift away from those views near his death.
I have a feeling you and I are not going to come to much of an agreement on this issue. So it's probably not worth my time to make much of a response, but I will.
1. You are correct, my mistake.
2. The Kentucky Resolve was cited by New Englanders when they refused to abide by the embargo act President Jefferson enacted in 1807. Considering that they did in fact seriously consider seceding just 7 years later, it is obvious to me that it was common knowledge at the time that they had the right to do so.
3. "It crushes "nullification" and must hasten the abandonment of "Secession." But this dodges the blow by confounding the claim to secede at will, with the right of seceding from intolerable oppression. The former answers itself, being a violation, without cause, of a faith solemnly pledged. The latter is another name only for revolution, about which there is no theoretic controversy."
Taken directly from Madison's letter. Don't think that I am advocating that any state should secede just to do it. I am merely stating that the states have the right to do so if they are being mistreated by the federal government, as Madison's letter clearly states. The south had the right to secede from the union, and President Lincoln had no right to stop them. He should have been diplomatic rather than tyrannical in his approach.
4. The founders believed in checks and balances, and knew that the states would have to overrule the federal government from time to time. When they refused to abide by President Jefferson's embargo, the Connecticut state assembly had this to say:
"But it must not be forgotten that the state of Connecticut is a free sovereign and independent State; that the United States are a confederated and not a consolidated republic."
Obviously Lincoln did not attack personally, but you know what I mean.
Then you will have to quibble because I am using the term for both meanings. The result of the Civil War was unnecessary bloodshed, and an extermination of the sovereignty and independence of the States.
There were men in that period that had no problems with black people and helped them to freedom, rather than try to force them out of the country into a new environment that they probably would not have been able to survive in.