How can singing a national anthem be a crime, I think you are exaggerating. Folk singing is encouraged everywhere, come on Germany, please. The American flag flies everywhere, nothing wrong with flying the German flag, come one you see the German flag in soccer stadiums come on, thought crime you act as if some Germany is under some evil nonsense, you can raise your flag, I don't think anyone cares. You can sing your national anthem if you feel so passionate about it, who cares, what harm can that ever do.

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The Eagle is Mighty, Crows are Many.