This... I don't even...
It's a game about commando missions in world war II, of course it'd have nazy imagery. It's also a game about killing nazis, not about how awesome they are.
If we go by that same insane logic, the downfall should never have been made. Double standards, much?
There is indeed a double standard in effect. According to German law, video games are not recognized as "art". Movies and books are.
That's why Indiana Jones and the Last Crusade can be shown at prime time on TV without any censorship, while the graphic adventure game based on the film had to have all the swastikas replaced with large black squares.
Similarly, all ads, posters and DVD covers for "Inglourious Basterds" were censored, whereas the film wasn't.
Hell, they even banned the sale of anti-nazi t-shirts, because they depicted a swastika being smashed into pieces by a fist. Apparently, the words "AGAINST NAZIS" above that picture were too subtle.
It's all about the pure usage of the "anti-constitutional" symbols. Context is irrelevant to them, because it's not officially "art" and so far, no developer or publisher of video games went to court to fight this.