The main concern/fear about bioweapons is that they spread themselves. It’s not like a bomb or a machine gun, where once the bomb explodes or the gun stops firing the danger is gone. A bioweapon will self-propagate through the target population, which means it remains a risk for a much longer period of time.
Worst of all, because it self-propagates, it can spread to uninvolved countries or even back to the sending country. That makes it a risk to everyone on the planet, not just the country under attack. So these are ranked up there with chemical and nuclear weapons because they have the ability to be so deadly and indiscriminate.
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