My abstract reading of the rule: we should minimize negative externalities while maximizing positive ones, while curtailing selfish behavior. IE, the ambulance

My abstract reading of the rule: we should minimize negative externalities while maximizing positive ones, while curtailing selfish behavior. IE, the ambulance is there altruistically; a riding lawnmower, similarly. The airplane has few negative externalities (to the visitors of the park), whereas a drone has more negative externalities and few positive ones. An ambulance that rides over the grass and tears up the soil better be in pursuit of an urgent need, a police cruiser similarly driving over the soil to stop that drone pilot has inadvertantely created greater negative externalities in pursuit of enforcing a problem. The rule is simple: don't be a jerk, think about others, don't be oblivious.