Black swans arise because when people design things that work 99.99% of the time, they tend to relax and rely on the system more than they should, and when this

Black swans arise because when people design things that work 99.99% of the time, they tend to relax and rely on the system more than they should, and when this 0.001% event happens, they are completely unprepared. The correct mode of operation is to always be prepared, without relying on the "perfect" system too much. If system is actually good, "chaos monkeys" may be employed to keep everybody prepared.