The public is rarely told the truth by the people who got it wrong. Maybe it comes out from official records under the hundred years rule, but sometimes we are lucky to get that. And WTF will remember it then?
So far as bio-weapons are concerned, the big problem is developing an antidote before you use them, in case your own side gets infected, or if you have to occupy infected countries.
I can see electronic technology being used to a much greater extent; especially with so many satellites scheduled to go into orbit. Capable of tracking individuals from their smart phones down to the nearest metre, and sending mini-drones to observe, listen, and even destroy them.