We use and need to use both systems in complex political societies, and we oscillate in our commitments, because both oligarchy and rule by the will of masses have their bad points, as the ancient philosophers all knew.

Claims like 'Slavery is wrong' are not fully common-sensical, so they must be at least partly theoretical.

You can find many philosophy papers on the themes of 'love' and 'friendship,' most of which are cheerful and somewhat anodyne; you don't find many on the loss of friends, relatives, and lovers from death or alienation, though it happens all the time.

Even if you just want to make a simple clothing item for yourself or go for a long hike in the forest - something we imagine requires absolutely no resources - you have to go to the store and buy a lot of stuff, and probably use a car.

If you live in an acquisitive society you are likely to be acquisitive, but it isn't deeply rooted in human nature, except in the sense that it's deeply rooted to be psychologically receptive to your peers and to advertising.

Maybe we will get to this point and reach a decision one way or the other with 'Human cloning is acceptable,' but I doubt that it is ever going to happen for 'It is morally permissible to eat shrimp' or with the general formula 'Adultery is wrong,' whose intended extension is again very unclear.

You can reasonably make the intellectual journey from thinking it's permissible to eat shrimp to thinking it's not permissible, or vice versa, whereas our slavery journey was uni-directional. We are as certain we are not going back to that old kind of slavery as we are that we aren't going back to the geocentric universe.