It's not yelling but drawing emphasis to head off the argument that I (correctly) thought was coming, making allusions to Nazi monuments, etc. There were no fascist states - Euro or Islamist - on AMERICAN soil; why would there be monuments to them? OTOH, there were eleven states who tried to peacefully leave a union they no longer wished to be part of. I think they "hated" being in that position and subsequently hated being invaded. So yes, once the war was on, I'm sure they hated the Union government. That 'I'm A Good Ol' Rebel' was penned in the 1860s supports that.
I disagree; Lincoln acted as an authoritarian. If eleven states are not to determine their own governance, when are any people anywhere to do so? It is the very principle that fueled the Declaration, and then founded a government constitutionally checked by a 2nd Amendment fail-safe. It's not historical romance from my perspective; one either stands for the proposition in practicality, or really doesn't at all. And stripped down to that essential element, the secession states certainly had the right to leave and other arguments are superfluous avoidance of that fact.
You don't wage scorched earth warfare to subjugate those states, then expect sudden buy-in to North/South brotherhood. As Lee framed it:
"A Union that can only be maintained by swords and bayonets has no charm for me. If the Union is dissolved and government disrupted, I shall return to my native state and share the miseries of my people, and save in defense will draw my sword on none."
I learn from a CW marker as much as I learn from any historical marker; they're jumping off points for further looking into things which pique your interest, not a treatise.