Well Sean, you beat me to it, us 'M's better stick together eh? The "Horst Wessel Lied" may have the artistic merit of a dirty handkerchief, but it is not anti Semitic, and it is no more nationalistic and militarist than most National anthems. As you say it is propaganda, or to put it another way, part of a multi media branding exercise to raise the awareness of the public and to increase the market share of the organisation.
Personally, I am with Don, we have no right to deliberately offend, and therefore an obligation to censor ourselves. We also have, I believe, an obligation to maintain songs as collected/written as a contemporary record. Incidentally Don, I think it could be validly be argued that people were no more racist in the past, they were perhaps more open in their views; apart from hypocrisy, what is really the difference between "No niggers need apply" and "I'm sorry sir, we welcome applications from people of colour, but I'm afraid we have no vacancies at present"?
Ultimately Voltairine de Cleyre's statement says it all, thanks Sandy.
Pete M - another red under the bed.