When you have a billion citizens you have a few to spare.Do any of you believe that is is an attack on our nation by China? To weaken us even if it gives them a bloody nose also. A bio war attack on the world with the richest nation weakened and if it does not get things under control, may lash out as a response. China may be betting that we do not. For it may mean the end of everything if we do. Is this idea to extreme?
If I were to develop a Biological Weapon, I would develop a vaccine first and make sure my population was inoculated before I released it on the rest of the world.