How Naive can you be?
Clearly cyber attacks can kill. Software errors have caused deaths in a number of reported cases, the only difference between these and an attack is the intentions of the creators. Hackable automatic insulin pump are already being used and the manufacturer refused to fix the vulnerability.
Imagine an attack that disrupted all air traffic control communications, or worse, created false readings and misinformation for the controllers. Imagine an attack on a water treatment facility that pumped contaminated water in the main supply.
You, Dr. Rid, are exactly the type of small minded individual that would prevent us from preparing against such attacks. It only takes one well placed bullet to start a war, and cyber attacks can do more damage than a bullet.