These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fridge Horror: A good deal of them, such as the ones involving Deadline News. There are mentions of some reporters sobbing while others desperately trying to go out in dignity by staying on air for as long as possible...
Moral Event Horizon: Doomsday itself definitely fits the bill. Though a more specific example would be the Soviets' attempt at invading Austria despite its neutrality, beginning with dropping two warheads indiscriminately over Vienna. They failed.
Never Live It Down: In-verse. In the case of at least some countries, any mention of either the USA or Soviets is bound to bring up memories of how they blew it all up. The Siberians and American successors meanwhile have all but accepted their reputations.
Japan in particular has developed a very strong national grudge against the American survivor-nations and just about anything American. While New Britain still insists that it's the legitimate successor to the United Kingdom...which the peoples of the Isles don't take too well.