I have thought that since ISIS used Chlorine gas against Iraqi soldiers, they wouldn’t mind using it against civilians. Also, a disease that can come back to get you is dangerous, especially when ISIS wants to have an empire to rule over. How are you going to have an empire when you are loaded with the sick and dying of your own people, including even your own military personnel?
“How are you going to have an empire when you are loaded with the sick and dying of your own people, including even your own military personnel?”
ISIS is so exteme that even Bin Laden banned them. And if I remember correcdtly , they believe in an islamic version of Armageddon. So it would be foolish to put anything past them.