The argument from design is ultimately an appeal to miraculous causes, i.e., causes that do not, and cannot, occur in the natural course of events. This is why an explanation via design is not a legitimate alternative to scientific and other naturalistic modes of explanation. To refer to a miraculous cause is to refer to something that is inherently unknowable, and this sanctuary of ignorance explains nothing at all. However much it may soothe the imagination of the ignorant, it does nothing to satisfy the understanding of a rational person.