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Because "safety regulations are written in blood". Disaster happens, reactive preventative measures help keep the disaster from reoccurring in that specific manner.

...in fields governed by science and stricture, anyway, like nuclear power or aviation.

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You can actually predict by that metric how safety aware your current surroundings are in production facilties.

Time of last incident, average promotion time (over time reduces safety awareness again), calculating that, one can behave acyclic until the next accident.

Sure. I noticed this at a hardwood flooring warehouse, in another life. In fields governed by science and stricture, however, the safety increase is effectively permanent.

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