It's not so deep. The takeaway is that modern terrorism will go through wires. Today, the logistics needed to generate massive power failure able to damage severely the economy of all developed countries are arguably simpler than what's necessary to re-create a 9-11.

I think we should fear and get ready, unit testing and agile software are not enough. We need to make sure some systems are NOT reachable in any way via internet, we need formal methods and expensive secure designs.

I really hope terrorists never get smart enough to attack digital infrastructures.