By Erik Goepner
One way to assess the threat that IS poses to America is to see what the National Terrorism Advisory System (NTAS) says. To date, NTAS has issued no alerts regarding the terrorist threat from IS. Back in 2011, NTAS replaced DHS’ memorable color-coded system. It is also worth noting that in those intervening years, the NTS has apparently not issued any alerts about terrorist threats against the homeland.
Statements by government officials provide another way to assess the threat, and they do not appear to suggest IS presents a significant threat to America. The President’s National Security Strategy (NSS), published last week, notes that “the threat of catastrophic attacks against our homeland by terrorists has diminished but still persists.” The NSS goes on to refer to “an array of terrorist threats.” As for IS in particular, the NSS mentions them as one of several “regionally focused and globally connected groups” that “could” pose a threat to the homeland.
Rolling out the new NSS at the Brookings Institution last Friday, the National Security Advisor appeared concerned that threat concerns were being unnecessarily inflated by some. Ms. Rice cautioned, “We cannot afford to be buffeted by alarmism and an instantaneous news cycle,” as she characterized the threats as not existential.
Another estimate comes from the Department of Homeland Security Deputy Assistant Secretary for Counterterrorism Policy. This past December, he testified before a House subcommittee hearing on ISIS. His assessment? “At present, DHS is unaware of any specific, credible threat to the U.S. Homeland from ISIL.”
If Americans’ perception of the threat posed by the Islamic State substantially differs from the actual threat, our unconscious biases may have something to do with it. Ms. Rice potentially alluded to one—the availability bias—when she cautioned against alarmism and the instantaneous news cycle. The availability bias suggests people estimate the likelihood of an event based on how easily they can imagine it or remember a past occurrence. Since the sensational, yet uncommon, event is often of greater interest to the media, the public may hear more about unlikely events than they do common ones. In response, people overestimate the likelihood of rare events while underestimating the probability of common ones.
Additionally, people tend to overstate threats they dread, even if the evidence indicates otherwise. The Islamic State’s gruesome videos of beheadings and the recent burning alive of the Jordanian pilot effectively evoke dread in many.
Potential biases notwithstanding, those responsible for assessing the threat and keeping the homeland safe indicate that the Islamic State could pose a threat to us, but at this time, IS does not pose a specific, credible or imminent threat.
Image Credit: The Knight Foundation
 See, for example, Morgan’s “Risk Assessment and Management.”