 There would presumably be similar worries about the other kinds of normative fundamentalism: not only will we lack an explanation of what makes the base-facts (reasons, values, fittingness, etc.) normative, but in many cases, there will be (putative) base-facts that do not seem robustly normative. That will trigger a need for a non-question-begging explanation of the difference between robust and non-robust (putative) base-facts, which might or might not be a deliverable good.