@Narf
There's around a thousand people on the island (chapter 1). It's also been a year and a half since the story's begun. Since then, there's been
Takehiro's appendicitis (on island)
Uchi's AAA (on island)
Hoshino's drowning (on island)
Yukako's eclampsia (on island)
Tatsumi and Kunio in the landslide (on island)
Abe's mom with her sepsis and Dietman Ashida with just his kidney stone (on island)
Hostage taking (on island)
WW2 bomb explosion (on island)
Masato falling off mountain (on island)
Kumagai's surgery (off island)
Okuda's echinococcus (on island)
Fumiko's breech birth (tourist on island)
Food poisoning (on island)
So maybe 12 total on island incidents out of a total population of around 1000 over a year and half. That doesn't seem too bad to me. And we don't see all the common, dull clinic visits, many of which are probably geriatric (which isn't necessarily what the mangaka wants to show us) and which Dr. Koto also commented about in chapter 1. It just never bothered me when I was reading it.