Very well written, & formatted Tree. You make some provocative & possibly worthwhile suggestions.
I dunno, though, some differences, especially as Germany doesn't (or didn't) have a first amendment, or the traditions it promoted. E.g., I supported the ACLU in their efforts to allow the Nazis to march in Skokie (though I'm also glad they didn't).
Also, the north fought mainly to preserve the Union, not to end slavery. Lincoln characterized the war as a crusade against slavery for political reasons, but later re-framed it, in the Gettysburg Address, in terms of preserving liberty (by preserving the Union).
I also think abolition need not entail a desire for equality. Many, including Lincoln, at least for a time, assumed freed slaves would be re-located to Africa or even South America. My point being abolition is not incompatible with white supremacy.
None of that is to say we can't or shouldn't make a concrete commitment to ending racism. The question remains, what form would it take?