Not Epstein. I've joked the next generation will all look eerily like Bill Gates, but I think he's mostly smart enough to avoid the inbreeding.

Disease was a weapon, and my guess was an attempt at airborne AIDS. The "modern bioweapon designed by AI" aspect is evident in that the delivery vehicle (which is the first target of medical countermeasures) also is cytotoxic (to save yourself from A is to infect yourself with B).

Vaccine is simply a controlled mankiller. They have targets but they can't shoot people in the streets. Some vials are death, and those go to the enemies. Everyone gets a shot, and lots of people get side effects, so it's not suspicious.

It was all a dead man's switch. But he's not dead, oops. Now they're stuffing all the misery back into Pandora's box.