Highlights:
Not everyone has the same idea of how they should be treated by others, not everyone will be led by the Golden Rule to the same moral maxims.
The Golden Rule is not useless, but it is not as useful or informative as it often appears.. it can be seen as a reminder.. to look at things more objectively, taking into account the perspectives, needs and desires of others as well as ourselves.. it is a call to empathy.. however, the idea that it provides a universal basis for substantive morality just doesn’t fly. That is why, despite the fact that everyone seems to agree on a need for the Golden Rule, we still don’t agree about how we should actually live.
If you look at how we actually make moral decisions, we do not and could not calculate all the likely effects of our actions every time we make a decision.
To recognise you could do something to contribute to a better, fairer world does not place you under an obligation to actually do it.
Emotion is thus the tool by which reason gets us to do what reason demands.
We can identify many things that matter for morality: happiness, respect, equality and so on. But it is impossible to say that one principle is the master principle, from which all other moral rules are derived. In different times, at different places, for different people, moral priorities change. Just as babies, children, adults and the elderly need to be treated differently, so other variations in the human condition require different moral responses. That, I suspect, is the truth that makes some kind of relativism inevitable.