The problem with that assessment is you are relying on the attack vector to be physical. ISIS, unlike al Qaeda, has realized the power they have with cyberattacks. Since we’re all attached around the world, it’s relatively low-cost to attack American, or Western, interests through the use of network-based attack vectors. Many of these hackers have entire fleets of compromised computers (botnets) around the world that can do their bidding. The central control mechanism is skewed by the distributed nature of the network. The damage is done by unsuspecting people around the world, and the perpetrators are never caught.
This attack is predicted to affect network-based systems, although the actual target is unclear.
Thank you for the explanation.