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We now know that some of the anthrax letters contained a novel, highly-weaponized form of anthrax that originated from a US military laboratory. Ask yourself this question. What's more likely?
a. This form of anthrax was designed by an alcoholic deranged lunatic, who was operating by himself and whose work remained undetected, despite the fact that he was operating right under the noses of a bunch of other anthrax researchers in a supposedly secure US military facility.
b. This form of anthrax was designed as part of a clandestine (and illegal) bioweapons program at a US military facility, and the government was willing to pay millions of dollars to an unwilling scapegoat (Hatfill) in order to shut him up, and now they're willing to blame the whole thing on some guy who just committed suicide.
Take your time making your choice.