I wonder if the wide margin is the AI trying to formulate logic and numbers in the story but it realizes it doesn’t know how many officers would be needed to shoot the earthquake since it would logically depends on the magnitude of the earthquake which the AI doesn’t know so it figures well alright tectonic plates are rather resistant to firearms discharge and other potential law enforcement tactics so it starts high at 50,000 but decides 1,000,000 is a reasonable cap as there just can’t be more than that many officers present in the state or country