BMW made aircraft for their country amongst other things. Ironic that Rolls-Royce did the same for theirs and now their vehicles division is owned by BMW. VW werke (now Bentleys owners, also ironically) had a far greater involvement with the Nazi's, yet I drive one and my family are from Poland originally. Go figure. I'd never rudely associate anyone I didn't personally know with murder, torture or genocide in public.
So walking into a BMW Motorrad dealers in Germany and asking the salesman for "one of your finest Nazi staff bikes please" won't cause offence then?? I think you might be invited to leave the dealership, you may even be invited for a chat with the Police.
As for being pompous, I work in the Rolls-Royce Motor Cars factory at Westhampnett near Goodwood from time to time which is staffed by a LOT of decent German people. They wouldn't find the N word funny and I certainly wouldn't embarrass myself or them by using it whilst on site, not even as a (misguided) joke.
Imagine the scene:
Bad Nazi Joke

.......: First reaction

.......... Final result
I'm not asking for an apology from ATT, I know one won't be given. I just feel a bit ashamed to be English sometimes.