Of course it stands up. What does not stand up is that 94+% of White Southerners voted to secede in order to protect the property of 6% who owned slaves....even though slavery was not threatened in the US and even though the union government went miles out of its way to make it clear that slavery was not threatened within the US.
What makes much more sense is they felt they were being screwed economically and wanted out.
The right to vote was restricted in the Antebellum South to substantial property holders, which commonly meant slaveholders. And slavery was integral to the South’s economy, even for non-slaveholders. Similarly, I do not own an oil well, but I want them to keep pumping.