From page 40 of the FBI Summary Report:
Through the end of the summer and into the fall of 2001, Dr. Ivins was expressing his increasing frustration with this criticism of the work he had been doing. This frustration was only compounded by demands for more information regarding the anthrax vaccine research program, largely from Matsumoto, who had written a critical article in Vanity Fair magazine in May 1999, and who was working on a follow-up book entitled Vaccine A (which was eventually published in 2004). Within days of reading Matsumoto’s Vanity Fair article, Dr. Ivins commented in an e-mail to a former colleague: “[T]hanks for passing these along to me. I wonder when the National Enquirer will come out with its headlines on ‘Guinea Pig Soldiers Get Killer Vaccine.’”
From page 72 of the Expert Behavioral Analysis Panel report:
His therapist thought his symptoms “may be that of a paranoid personality disorder,” he wrote her in July. He also indicated that he would like to serve as a case study for her medical training, and that he did not want to see “PARANOID MAN WORKS WITH DEADLY ANTHRAX” as a headline in the National Enquirer.
One comment in only one email over an entire life of emailing does NOT make a man obsessed with the National Enquirer.
If that's all that you've got, then you fail.