The fact of the matter is that there are many more close calls than there are actual disasters. See this short piece (that seems to digress at the end ...), but note that capturing the near misses and correcting what led to them will enable you to keep from having a future full-scale disaster, Once in a blue moon: What we can learn from things that never happened.
Tom Cox shared the link above.
I would also add that Blue Moon disasters are the types that keep people from worrying about these events. They seem rare in their personal life experience and thus not worth worrying about or becoming prepared for.
