Let's say a group of Chinese citizens took it upon themselves to build a rocket that could carry a warhead. These citizens then loaded a bomb onto the rocket a

Let's say a group of Chinese citizens took it upon themselves to build a rocket that could carry a warhead. These citizens then loaded a bomb onto the rocket and launched it at a neighbor (Japan, India, Russia) take your pick. What would happen? What if the Chinese gov't had full knowledge of this but failed to stop them? OR say that a bunch of hackers in the US decided to hack into German banks and steal info. Would the US gov't be negligent if they didn't stop them? After say 100 attacks of either type above, would the gov't still have an excuse? Could it claim "this is a group of private citizens" and be taken seriously in the world stage. Either it's government sponsored or it's a government law enforcement problem. So in the end..how much does it matter?