I seem to remember smallpox pretty much cleared North America for the settlers.Both Western European and Chinese civilizations were massively destabilized by pathogens several times in their histories. The lefties have done a pretty good number on Africa with malaria by impededing their access to DDT.
Seen what their doing with mousepox recently ? You can do the same with smallpox.
True, but that disease is still militarily insignificant. Africa still stands just as before, with the same military dispositions. Heck, people can even be cured of Malaria. Witness Chris Mathews.
Leave biological devices for the little old ladies to worry about. At best they spread little more than fear.