Stephens and Lincoln documents

No one could make it more clear than Alexander Stephens did that the Southern states withdrew from the United States on the issue of slavery alone. Unless Stephens spoke to the crowd gathered at Savannah, Ga on March 21, 1861 on his own accord and without the sanction of any other Confederate authority, any post war explanation of the motives of disunion that relied on states rights as its bedrock is nothing but a weak and untruthful argument. I also find it incredibly interesting that Confederates used the constitution extensively as their body of evidence that they were acting in the true spirit the country's founding principles. In his speech in 1861, Stephens actually asserts that the crafters of the constitution were ideologically wrong in their assumption that all men were created equally. Observing flaw in one aspect of the constitution severely diminishes any other argument that uses the constitution as its legitimizing document.
I also found it interesting in Lincoln's Emancipation Proclamation that, although he based this act on the purpose of its justice, it only applied to a portion of the enslaved population. Regarding states like Missouri, Kentucky, Delaware and Maryland, which were not in rebellion to the Union but at the same time sanctioned slavery, Lincoln said, "are for the present left precisely as if this proclamation were not issued." It seems that if the emancipation of the slaves was an act based solely on justice, then the entirety of the slave population would have been emancipated. It seems more appropriate that Lincoln used the emancipation of the slaves in rebelling states more as a bargaining chip than a civil rights act.