Did they do it secretly?
No, it was rather obvious when the US military mobilized for the Iraq invasion.
If you want to ascribe grand long game type scheming and murder on the part of the government to release anthrax, then by the very nature of such a broad and nefarious plot it would require more than one person. To make it "appear" to be the act of a single man whilst really being a part of an evil plot by teh NWOz would require a great many people to do effectively.
Secrets are hard to keep. Really hard. Really, really, really hard. And a plot like this, which makes absolutely no sense from the OPs description, would either require a substantial number of individual actors to accomplish, or just one with a grudge or a serious mental health problem. The middle ground is fairly desolate. If it's just one man, as it appears to have been, then it's not a government conspiracy to draw us into the Iraq war. If it is a government conspiracy, then we would have found the culprits through the sheer numbers of required conspirators involved through detective or intelligence work.
And if the intelligence communities from the rest of the world ever found such a plot? You really believe they wouldn't say anything, quietly or otherwise?
The world doesn't work like a bad CIA thriller. It works by human acts, and humans are, typically, small, petty, greedy, lying bastards. (Present company excepted

) Anyone willing to attack the media and the government simultaneously using a batch of anthrax supposedly easily traced to a single source, is either barking mad, or downright Machiavellian on a scale not seen before in the history of humankind.
Logic on the part of the attacker doesn't necessarily have to come into it. It's not an inherently rational choice to make. It would be relatively easy to come up with a twisted logic that justified the attacks in the mind of a single man with the right access.
I don't know the details or the reasons this man apparently did this, I don't think anyone really does. I havent followed the story since the early part of that decade. The illustration question was a simple example of what is more likely, and trying to get MaGZ to recognise that such conspiracies are much less likely than simple human frailty.