Di Lo's works are pure tripe and hackwork. So the Confederates allegedly believed in "self-determination"? And where was "self-determination for the slave? Where was self-determination for those who opposed secession? The Confederates believed in their conception of majority rule, as did Lincoln. Lincoln's conception had more legitimacy. It coincided with Washington's and Madison's views. Lincoln's view of liberty and majority rule was more in accord with the Constitution and Declaration of Independence.
Had the Southern leaders really acted in a pacific, non-belligerent, libertarian or democratic fashion, some of DiLo's criticisms would have merit, but the rebels were determined to realize their desires through force, and I don't fault Lincoln for taking steps to maintain the lawful order.
Last I checked, that "force" was only intended to remove a hostile nation's troops from within the confederate's own border. Lincoln's steps to "maintain the lawful order" on the other hand appeared in the form of a full forced military invasion of the south.