Companions in Guilt

Hume's guillotine can be stated that it is impossible to deduce an ought from an is---the implication being that no normative claims can be true. The issue with this view is that it wipes itself out---the Humean is asserting an epistemic norm that you should only believe in certain types of claims:

You should only believe in the existence of stuff you or someone trustworthy have experienced or that must exist in order to explain the stuff that we have experienced.^[1]

It is simply arbitrary to make an exception for that epistemic norm as being truthful whilst rejecting every other normative claim.