My first thought was that even simply not apologising is doing better than England - going by the history books I've read, we still seem proud of at least some of the shit we pulled. "Sure, it was the wrong thing to do, BUT IT WAS FUCKING AWESOME!"

(Headcanon is that the nation-tans have made all the apologies they need to make to each other, but can't do anything about the humans because they don't control their humans and can't reveal that they exist. Hopelessly optimistic about the show, yeah.)