The FBI is after the upper echelons of organized crime, and organized crime can be terrifyingly intelligent and resourceful. As another commenter mentioned, some of the Mexican cartels have their own IT departments and private cell providers.
What is that based on? If they are so smart, why are they in a business where they're risking their lives, living under constant legal threat, and ruining the lives of millions of others? Lots of people get very wealthy without those risks, such as many in the Bay Area? Who is smarter?
Having your own IT department isn't a sign of genius.
2) There might be more unintelligent people than people who are both intelligent and so incapable of socializing that they can't find work.
If you haven't heard of the just world fallacy, it might be worth looking into.