Quite possibly because they had actually experienced what happens when the summer doesn't come. https://en.m.wikipedia.org/wiki/Extreme_weather_events_of_535%E

Quite possibly because they had actually experienced what happens when the summer doesn't come. https://en.m.wikipedia.org/wiki/Extreme_weather_events_of_535%E2%80%93536 https://en.m.wikipedia.org/wiki/Extreme_weather_events_of_53...