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Obvious question...
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?
I'll let others more versed in this correct me if I'm wrong but there is some confusion about "weaponized" and "lethality" with respect to the anthrax used in this case. Unless I am mistaken - due to the terrible job the press has done and what seems to be a concerted effort by some quarters to leak bad information into the mix - this anthrax was not "weaponized" but was highly lethal, although it appears it's lethality increased from the first letters to the last.