Terror
Inciting terror does not require creating an actual risk. Just say either "radiation" or "dirty bomb" and people get extremely nervous. Have something go boom and spread a small amount of something that will register on survey meters and you can create a major panic, even if there is no actual danger. You don't even have to tickle the survey meters, just tell the hyper-competitive media that smoke bomb you just set off in the public park contains stolen plutonium and watch the breathless coverage incite a major panic. The whole idea behind terrorism is to generate fear, not cause major damage.
Biting the hand that feeds IT
