There are several very good websites which describe the details of preparedness planning for citizens.
There has been a transition from a nuclear-annihilation scenario to an isolated-terrorist-nuclear-bomb scenario. But we're still locked into a mind-set that nuclear war would be so overwhelming that any kind of preparedness would be futile.
Every single administration in American political history has put cronies and pals and donors into political positions. But normally those people become the ambassador to Liechtenstein or the deputy undersecretary of commerce.
There's detailed information on how to assemble a nuclear weapon from parts. There's books about how to build a nuclear bomb.
Disasters like Oklahoma City and 9/11 were time-limited. The children who were affected psychologically could go to a place of normalcy.
From a population point of view, it's actually very important that as few people as possible get the flu. People getting the flu is not a private matter. The risk for healthy people is really about your friends and neighbors and fellow travelers.
