Anthrax Suspect: Did shame, guilt or government drive him to suicide?

Is the answer to this question buried with scientist Bruce Ivins or can we make sense of the wild accusations swirling around him: anthrax scare mastermind? homicidal maniac? or victim of misguided investigators and therapists? Weighing in are: Bioterrorism Experts Jim Poesl and Merwyn Walther, and Forensic Scientist Dr. Lawrence Kobilinsky.