Yeah. Even if one regard the actions Lincoln took as wrong you can’t regard the Confederates as the ‘good guys’. Since they left the union due to their zealous desire to not only keep but expand slavery (which legal or not was WRONG of them to do, extremely wrong).
To make a modern analogy. It would be as if Vermont left the union (say in 2003) so they could perform “abortions” up to the point of the cutting of the cord and Bush sent troops in. Even if you thought Vermont had the right to leave I doubt many freepers would be supportive of that decision or call Bush a ‘tyrant’.
So Impy, you are a ends justify the means kind of guy. So why bother referencing the Constitution and law? Lets turn it around, could the United States have gained its independence without the support of slave owning states? If you say yes, please explain.