Well, every weapon can be used for mass-suicide, so not much different in that respect. Few reasons: 1. Even without an antidote a weapon that could kill a si

Well, every weapon can be used for mass-suicide, so not much different in that respect. Few reasons: 1. Even without an antidote a weapon that could kill a significant portion of the population is a useful weapon. It acts as a deterrent from being attacked. Mutual assured self destruction is a powerful deterrent. 2. As political leverage. Eg. North Korea is able to leverage its nuclear weapons to extort the international community. 3. If you believe Biological warfare is where warfare is headed, you want to be at the forefront of that research.