However, the above account of a sort of "a posteriori" moral search is unsatisfactory in that normal value, and not moral value, can be used to explain the relevant events. Normal value arises from the relationship between desire and a state of affairs. People tend also to objectify such value, into categorical moral value, though this is fallacious. 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.