It seems that we adopt a formal ethical theory based on our pre-theoretical ethical intuitions. Our pre-theoretical ethical intuitions seem to be the product of our upbringing, our education and the society we live in and not to be entirely consistent, since our upbringing and our education often inculcate conflicting values.
So how do we decide which of our pre-theoretical ethical intuitions, if any, are right? It seems that we can only judge them in the light of other pre-theoretical ethical intuitions and how can we know that they are right? If we judge them against a formal ethical system, it seems that the only way we have to decide whether a formal ethical theory, say, consequentialism, is right is whether it is consistent with our pre-theoretical ethical intuitions, so we are going nowhere, it seems.