Why there are no German accents in Valkyrie

[Sussudio]

From Bryan Singer:

"We didn't want that to be what the movie was about. It's a thriller, it should be exciting-- the audience should be taken on a ride through the film. The actors speak wonderfully the way they do, in their current dialects, and the characters are all supposed to be German anyway. To have everyone putting on affected German accents, when in reality they're supposed to be speaking German, I promise you after 20 minutes you would be sick of it."

Uh hmmmm...

Guess this kind of makes sense.