The IL-4 mousepox stuff has been public for quite a while. My recollection is that it was done first by some researchers down in Australia.
My personal opinion is that 12 Monkeys probably got it right. If (when?) a species killer bug gets released, it will be a westerner that does it. You need a combination of ideology and capability.
There just aren't that many folks in the middle east with the labs and knowhow. But there's lots of hard-Greens in universities and some of them have molecular biology degrees. Wiping humans off the face of the Earth is, in their mind, a good thing.
OTOH, Islamists want to rule the world--wiping out the human race would stand in the way of that goal.