Are you stating a fact or just speculating?
H*ll, Ted Kasczinsky did a better job of planning than whoever did this Anthrax thing.
It's just some lonely nut who can't get a date.
BTW, my speculation is just as valid as yours. More, in fact, because all the investigative evidence points to internal terror; none has indicated anything different.
I make this point (continually) because the worst thing is to get sidetracked.
The Anthrax thing was a non-story except for the poor one or two folks who died.