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Except for [https://en.wikipedia.org/wiki/Act_of_God acts of god]and red-light incidents, disasters are preventable. A disaster is the outcome of a series of cumulative mistakes, human error that compounds an initial mistake. Once a threshold is reached in the cascading series of small events, disaster is almost inevitable.

No matter how well you plan, there is always the possibility of someone running the red light, and broadsiding you. By definition, a red-light incident cannot be foreseen. Sometimes skill and luck will serve you well; at others nothing will forestall disaster once the red-light incident has occurred. Worse, initial red-light incidents can appear quite innocuous, i.e., they do not look like one. It is only when you respond inappropriately to the first small triggering incident that they open like a Pandora’s Box to reveal the full scope of the disaster that awaits. Events then unfold too rapidly for human response. Mistakes multiply. A chain reaction sets in. Chernobyl goes critical. Three Mile Island barely escapes a similar fate. The unhappy bottom line is that you can never plan for everything. The [https://en.wikipedia.org/wiki/RMS_Titanic Titanic] is the iconic symbol of disaster. It was considered to be unsinkable despite obvious design flaws that were only admitted retrospectively. They combined with initial human error before and after the collision to create a full-fledged disaster.