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I can see no reason to do so. Why use fake powder and pull a hoax that there was anthrax when the US government has tons of the stuff? (well, I hope not "tons")
It is like the fools who wanted to claim that the plane that hit the pentagon was really not a plane. That story is an obvious government plant since using all Planes was the MO of the day and slipping in a missile for no good reason would just be stupid.
So, why don't you come up with a reason why the whole anthrax thing would be a hoax; I mean, you don't think Bush was squeamish about about Americans getting hurt do you?