I could be wrong, but I think all the Nazis that wore any kind of armband did so because it was part of some required uniform, by and large that of one of the dozens of uniformed party organizations (some armed and some not) rather than as a public gestrue of nationalism or the uniform of any actual official government organization or armed force. So, the Nazi analogy is a lot closer to the 'Wear orange' or 'Code Pink(o)' freaks than it is to anyone choosing to wear a flag pin.