We can look at the types of things that have been caught during this period and how. Using that we can get an idea of what kind of threat are out there and it's

We can look at the types of things that have been caught during this period and how. Using that we can get an idea of what kind of threat are out there and it's mostly a) successful lone wolves who don't get caught and b) troubled people who get into a plot made entirely of FBI informants/agents from start to finish.