I knew a fellow who dressed up as a "vampiric" Hitler at a Halloween costume party a few years back, we all thought it was hilarious, even my Jewish friend got a kick out of it and didn't take any offence.
So to me, this seems pretty contrived. I think most normal people understand the difference between "joke" and "reality". Hitler was paraded about in a Mercedes, so that must mean that anyone driving a Mercedes is an anti-semetic nazi sympathizer? It's along the same ridiculous lines. Uniforms and symbols are meaningless in themselves, actions however are the same regardless of the attire.
Another thing to consider, is that *most* of the individuals who wore those unifiorms during WW2 had nothing to do with killing Jews. Many of them fought and died bravely for their country, and I don't think it's fair to demonize and punish _all_ of them due to the heinous actions of a select few.
If I were Harry, I'd tell anyone asking for an apology to kiss my a*s.