Richard: Which computation? Well... the computation your brain is, under the hood, performing when you're trying to figure out things about "what should I do?"

The full details of the computation may not be explicitly availible to you, but if you're saying "the thing that your brain is processing when you're considering right&wrong/should&shouldn't isn't what you mean by should&shouldn't", then how could you even be said to mean anything by those words?