First of all, a government killing mass amounts of its population has happened before (Nero burned 2/3 of Rome to the ground for example), secondly, what could be more bothersome than a nuke? Third of all, even if you don't buy the argument that the government could nuke us at any moment, they could still gain an edge by using weapons we have no way of accessing, such as bullets that track their target (yes, those exist, and I'm pretty sure you don't have any).