It's still weird, like you haven't eaten in three years, and zombies live right outside your door, how are you still alive? Do you eat people?
Granted with the few people in gaiden and the large amount of zombies comparitively, I wouldn't doubt it.
In Valentia, if you aren't in the war, a mercenary, or dead, you were the very small minority. Countries can't survive like that, let alone whole continents.
Should probably add pirates, those are a thing too.