Humans are like that. We assume things will stay the way they are perpetually. Calgary is built at the confluence of two major run-off rivers in a time when glaciers are melting away. There are no guarantees our city will remain in the state we expect it to stay in either.
Although I have to admit volcanoes are a bit more visceral in terms of their ability to threaten. Floods are bad but molten rock flowing through your house? That's something else completely.
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