Sometimes benefits and externalities depend heavily on social structures. Various complex financial arrangements would qualify. Sometimes they&#x27;re entirely natural, like if I make a fire for warmth and the smoke blows to where you are. Antibiotics in farming looks much closer to the latter than the former to me.<p>I agree that neither point of view is canonical. That is basically my point: it&#x27;s only madness from a certain perspective, and it&#x27;s completely rational from another. Neither is right nor wrong, it&#x27;s simply that the different perspectives are in conflict.