There's no legitimate comparison of Confederates with Nazis I can think of, except perhaps that both, let us say, bit off more than they could chew.
So have many others throughout history.
No argument there, though you should tell that to some of the others on this thread who seem to think that the Confederacy was some sort to model for Nazi Germany.
I agree that picking a fight with the US Military by firing on Fort Sumter was not the best move, and I see nothing dishonorable in Americans who wanted to fight to preserve the Union. Lincoln's big mistake was caving to the radical abolitionist wing of his own party and issuing the emancipation proclamation, thereby turning what had been (rightly) perceived as a war to preserve the union into a war to "free the slaves." Many Americans were willing to sacrifice their lives or their sons for the former, not so much for the latter, and understandably so.
However, as I said in an earlier post, the push to take down statues and monuments honoring the Confederate dead and Confederate leadership isn't about loyalty to the union vs. secession. It's about an attempt to radical black nationalists and their Marxist allies to erase American history and to find yet another excuse to spit on the memory of "dead white males." You don't need to be a "lost causer" to recognize this for what it's all about.