What I don't get is why nobody ever thinks about the international relations angle. Say there is a biological weapons attack and humanity is wiped out aside fr

What I don't get is why nobody ever thinks about the international relations angle. Say there is a biological weapons attack and humanity is wiped out aside from some remote communities like Alert, Canada. Some tech survives like gears, but obviously computers go away for a while. In 3000 years people are aware that humanity was once great, but then destroyed itself with hubris. They may even have a fairly developed understanding of science based on what they could save (university text books would _certainly_ be hoarded and copied 10 years after the bio-attack). Now the society enters an age that is kinda like a more advanced renaissance. No more easy coal or oil, so they use electricity from wind turbines. What happens when they figure out what is at that site? They weaponize it. It's so obvious to me. If we want to stop people from getting killed by it we should hide it as best as possible. Or make it as hard as obtaining enriched uranium. Humans have always had a "Do whatever it takes" approach to war and there is no way a emanating death object is going to be avoided once they understand what it does.