I think I’ll stick to the well-known scenario: Lincoln started the war for the public reason: to preserve the Union, and only changed the primary reason much later, in order to justify the bloodshed and uplift the nation.
Yes, Lincoln used sneaky Jedi mind tricks to start the war by making the Confederates attack Fort Sumter.
Contrary to Horvath, both pro- and anti-slavery forces in the US prior to the Civil War believed that slavery had to expand to new states in the West in order for it and the Southern Way of Life to survive. Lincoln and the Republicans opposed expansion, and that was enough for some Southern states to secede when Lincoln won the presidency. More at wiki for those who care.
Add another denialism to the list. It would be interesting to see how many denialist beliefs can be found in a single person.