http://www.salon.com/opinion/greenwald/2008/08/01/anthrax/

Here's what Greenwald acknowleges in the "mainstream" Salon:

One week after 9/11, a person or persons within the US bioweapons community--referencing "9/11" in the letters--attempted to frame Muslims in a false-flag WMD attack on "opposition" leaders in the US Senate and selected members of the media. This frame-up was aided and abetted by ABC (Disney), whose assets proceeded to "fear-up" the US public in preparation for a war of aggression against Iraq.

But there's more:

Richard Cohen confirms that "a high government official" advised him to take Cipro "soon after Sept 11".
http://www.slate.com/id/2186766/

"The attacks were not entirely unexpected. I had been told soon after Sept. 11 to secure Cipro, the antidote to anthrax. The tip had come in a roundabout way from a high government official, and I immediately acted on it. I was carrying Cipro way before most people had ever heard of it."

This corroborates reports that Cheney's staff began taking Cipro on 9/11.
http://www.judicialwatch.org/2953.shtml

So even if Ivins was involved, how would "a high government official" know that a rogue bioweapons scientist was going to "go postal" with anthrax if that "high government official" was not himself involved?