The funny thing is, the people who will really pull some major shit, are several things. They are patient, they are competent, and, most importantly, they are discrete. They won't go running their mouths off. When someone goes around telling the world about crimes they committed or will commit, people in law enforcement call that a "clue". It's the same thing with thugs on the facespace and the mybook showing off pics of their drugs, while holding likely stolen, guns.
If you're going to do something illegal, don't tell anyone who doesn't absolutely need to know.
When the patient, competent, and discrete decide to pull some major shit, we will know about it AFTER it's already happened, and we won't know exactly who did it.
Also, ricin? What is this, the KGB? What will they try next, a little ammonium nitrate mixed with diesel oil? That's so 90s.