Comment by civilitty

No, it's causation. The probability that everything goes right in a sufficiently complex system is zero and the probability that a single failure will cause runaway feedback loops or cascading side effects is extremely high, which causes a stable system to go unstable and makes total failure almost inevitable. Without diversity, you can't recover from these failure modes (drastic changes in the ecosystem causing extinction in the case of evolution, limits of physics or economics causing a dead end in science and engineering, changes in the rest of the economy causing centrally planned economies to fall apart, etc).