Boss
Take a Memo:
Claiming Lincoln felt the same way is false and has nothing to do with the point.
It has everything to do with the point that he was just as much of a "white supremacist" as Stephens. The noted cheering and applause for Lincoln's comments indicate the "white supremacy" viewpoint was very popular... at least among Lincoln's supporters.
This should be enough evidence for any idiot to see that slavery wasn't about racial equality. So there is one of your points shot completely to hell. Your other point is about Stephens argument that slavery was vital to the southern way of life... okay, the top 4 US exports required slave labor to produce, three of them came from the south.