Do you say the same thing about burning the flag? That it is a fine line, from that to roasting people in ovens?
I think you are very wrong.
I do not think any of these fans would consider killing people over this, or most issues, hell they are pissed cause they see this band in support of Sadam instead of Bush. Are they wrong? Yes they are, I am 100% sure the Dixie chicks do not like sadam, though they probably do not want to see war over him.
I think you would have to go much further then book or CD burning to approach the insanity that was Nazi Germanys final solution.
I would be more worried about the Political correctness roadkill that wants us all to only think Nice happy thoughts, and is editing "bad words" like jungle and Mother Russia from our school books.
SO again, that is not a fine line, it is a huge gulf, that no reasonable person should be able to cross.