  If this interpretation is correct, the doctrine is probably untenable. Most human beings are naturally inclined to feel sympathy for others, including strangers, and thus to care to some degree about their welfare. But it would take a heroic feat of social engineering to get us all to care about strangers exactly as much as we care about ourselves and those close to us. And even with the proviso that we need benefit only those with whom we actually interact, the standard of equal care for others would seem to carry with it impossibly high practical demands.