Precautionary principle and defense-in-depth would have prevented this.
You plan for the worst, but most importantly you plan for multiple different versions of what "worst" could entail, and you have uncorrelated redundancy such that the probability of disaster reduces from p to p^3.
Ukraine made the same mistake by not putting mines along the border. Just taking it for granted that an invasion wouldn't happen.
Hedge your tail risks with cheap real options, folks.
You plan for the worst, but most importantly you plan for multiple different versions of what "worst" could entail, and you have uncorrelated redundancy such that the probability of disaster reduces from p to p^3.
Ukraine made the same mistake by not putting mines along the border. Just taking it for granted that an invasion wouldn't happen.
Hedge your tail risks with cheap real options, folks.