Yeah, sure, like the New York Post, or the Sun tabloid. The original target was the office of the 9/11 hijackers' landlord's office. The first target was chosen, for reasons still unknown, long before anybody but the hijackers themselves would have known about the connection. That fact alone is entirely dispositive of the source of the anthrax. That anybody could even entertain the idea that the anthrax threat campaign is not associated with the 9/11 attacks is a testimony to the almost limitless power of human stupidity.
There were no letters sent before 9/11. I'd agree that a left wingnut might be nearly as likely as a right wingnut, but the main body of evidence points to a domestic wingnut.
OBL had 9/11 planned over years. With the resources at OBL's hands, he would have found a way to inflict tons of the stuff on America rather than a pathetic few ounces. The evidence points to a very determined individual with limited resources.