This is a common error, if not outright fallacy. The correct amount of <negative event> is rarely zero due to diminishing returns -- it is where the cost curves

This is a common error, if not outright fallacy. The correct amount of <negative event> is rarely zero due to diminishing returns -- it is where the cost curves intersect. E.g. to decrease 3pct to 0.3pct might require operating only half the drones -- not a good trade.