According to the Guardian, Tobias Kniebe from the Süddeutsche Zeitung said about Inglorious Basterds:
“This is pop culture meeting Nazi Germany and the Holocaust with unprecedented force,” said the film critic of Süddeutsche Zeitung, Tobias Kniebe, before the film had even started shooting. “The effects of this collision are utterly unpredictable.”
Uhm… I’m not sure that pop culture was that unaffected by World War II before, but in any case – what is he afraid of happening?
I’m seriously asking. I have no clue what his problem is. Do you?
kalafudra's Stuff 
You forget that the Nazis should be absolutely taboo pop culture, because using it in that way would trivialise the Worst Thing Ever (TM) and then there would be another Holocaust withing a week.
Seriously…if this worrying trend isn’t stopped, there will soon be jokes about Nazis, and silly people putting on Nazi uniforms for costume parties, and somebody will write a musical about producing a musical about Hitler, and then THE SKY WILL FALL !!!11!!
Right, right, there was that… I forgot for a second. I guess that’s my completely depraved atheist morality for you.
I just can’t wait for the sky to fall…