I'm not arguing that the South was in the right, or that slavery was a good thing, or any of that. I agree 100% that the institution of slavery was one of, if not the most, terrible things this country ever implemented and represented and condoned.What would you think about a person wearing a Swastika in a Synagogue? The South was on the wrong side of history and the country is better off the North won.
As far as the synagogue thing; Well, see, you're making up a scenario that needs more clarification. Do I KNOW the person well? Does the synagogue know them? Is the person Jewish? If their intent for wearing it is to strike fear in the minds of the members of the synagogue, then I would think they are purposely trying to be offensive and therefore unwelcome. Would it bother me personally? It depends on the details to what I just said! If I saw it, I might even be inclined to walk up and politely say "Hey,man. Why the swastika?" There may be an enlightening answer on the way! There may be an answer that wreaks of "This guy hates Jews for being Jewish." But, if I just assume that because he has a swastika that he must hate Jews, then, on some level, I'm generalizing. It's a legitimate generalization, but I could be find out my generalization was wrong.