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actually if you have watched the Mel Brooks film, which i have, its hilarious.
it is in the storyline you get the point of the Mel Brooks film, it's as they say a satire on the nature of celebrity. In the same way that Charlie Chaplin depiction of Hitler was an anti Hitler piece, both have something of value to say about that man and his vile regime. Mel Brooks is Jewish i think? so if he thought it would offend, it's unlikely it would have got the go ahead.