David Willman tells us today that the FBI missed Ivins for so many years because it was obsessed with Hatfill. Is this the FBI's apologia?
The FBI is a federal law enforcement agency; it is not a person with feelings and quirks. I don't think we can let the FBI off the hook because of an "obsession."
Definite, critical evidence exists in this case: anthrax letters, and those hoax letters that were sent by the anthrax mailer. We know where and when those letters were mailed. For the hoax letters, we may only know the general area (where they were postmarked), but for the anthrax letters we know the mailbox.
If one individual committed this crime, that person must be able to be placed where and when every one of the letters was mailed. If no single suspect can be shown to have had the opportunity to mail every letter, then more than one person must be involved in the crime.
This is basic criminology. Is there a conspiracy (which, btw, is defined as a secret agreement between two or more people to perform an unlawful act) or not? How has the FBI explored this possibility, which should have been a major consideration throughout its investigation?