Let's put it this way ~ the anthrax appears to aerosolize readily ~ that does not necessary demonstrate the preparer's intent or capability.
I would argue the other way around. You don't get weaponized aerosolization via mere happenstance.
Very well stated. Free-floating anthrax spores have been killing people for countless centuries. It was a regular epidemic in wool-sorting mills during the Industrial Revolution. Free-floating anthrax spores killed a guy in Scotland just a few weeks ago.
Contrary to popular misconceptions, dry spores will float about with any need for additives or coatings. In fact, since spores would be lighter if they didn't have anything attached, they'll float best when it's just a single free-floating spore.
Ed