> Cyber warfare is nothing different then physical violence.
So you wouldn't mind then if I secretly install a program that makes your computer attempt to hack some US military network? Because that's a huge difference between physical violence and cyber "violence": in meat space, I can't hijack your body to commit crimes.
"Casualties of war" are, like it or not, a given. In war, if X is an active lethal threat, and the best expedient option is to destroy it ASAP, bystanders caught in the destruction are deemed acceptable losses. If a program running on your computer unbeknownst to you is doing something causing grave harm to others right now, those being harmed have the natural right to do whatever it takes, including at least equal harm, to make it stop.
In fact, that's the whole point of war: all other viable options for self-preservation (personal and national) have been exhausted, leaving only killing people and breaking things until the threat stops.
The whole point of modern war, is that you make other people kill each other, in order to profit from selling them both weapons and "help" them rebuild after the destruction.
Your body wasn't hijacked, it was doing what it had already planned on doing (going to the airport). When your computer is hijacked, it is actively controlled to do something it had no plan to do. The point I'm trying to make is that there's an element of control that is clearly in one to a high degree that is absent or debatable in the other.
This whole argument can get philosophical, but I see your point.
This is a problem of collecting evidence about who is responsible. It doesn't address the underlying nature of the responsibility. In your hypothetical, you are the one who is responsible both for the hacking of the military network (in the context of this discussion, presumably to do physical work like killing people) and for fingering someone else. This is indeed not very different from physically committing a murder and planting evidence pointing to someone else. Yet that does not cause us to challenge the notion of responsibility for murder.