 An adequate understanding of why the vacuity objection is unsound requires careful attention to a further detail. The vacuity objection goes from the premise that every time a fact is not a moral reason there is some explanation for its failure to be a moral reason to the conclusion that the ‘no further feature of the situation explains…’ clause of the corresponding default principle will always be false whenever the fact in question is not a reason. However, this inference is valid only if it is valid to go from ‘there is some explanation of p’ to ‘some feature of the situation explains p’ and this inference is invalid. The inference would be valid only if we were to interpret ‘feature of the situation’ so broadly that any possible explanatory fact can count as a feature of the situation. This is not at all an intuitive reading of ‘feature of the situation’, nor is it the intended reading. Hence the vacuity objection is unsound.