My personal view comes from having grown up at the end of the Cold War. And I developed an interest in Russian history somewhere along the way. Russian culture has a strong apocalyptic streak to it. Both of those experiences led me to look deeper into apocalypcism.
Bernard McGinn is a religion scholar who edited a collection of essays about it. There's a view that it's a feature of Indo-European culture. It's interesting to compare different versions of it. Vikings, Persians, Muslims, etc.
Sometimes apocalypticism changes from just being a background feature of the culture to an expectation that the end is right around the corner. It's happened over and over. The passage you quoted is an example of it. I wonder if that sort of thing is a kind of stress response. Who knows?