Should we worry about cyberwar?

Pithiness from Bruce Schneier: "I'm not worried about cyberwar, but I am worried about the proliferation of cyber weapons. Arms races are fundamentally destabilizing, especially when their development can be so easily hidden. I worry about cyberweapons being triggered by accident, cyberweapons getting into the wrong hands and being triggered on purpose, and the inability to reliability trace a cyberweapon leading to increased distrust. Plus, arms races are expensive."