So, a situation that can be explained by the existence of real moral value (e.g. the fulfillment of preferences, the tendency towards social stability) can also be explained by non-moral value. This explanation is far simpler, given the ontological difficulties surrounding moral value. As J. L. Mackie argued with his argument from queerness, moral values (i.e. oughts) that exist in the natural world (of facts), is highly queer, and we ought to favour a completely naturalistic explanation instead.[10]