The point is that every update of a scientific theory shifts old "why" questions to new ones. Science will not ever and does not aim to provide an answer to the ultimate question of why anything exists at all or why a given theory of everything applies rather than another (indeed, string theory for example posits a possible, if not actual theory of everything).
In this sense, in the scientific study of consciousness, we do not aim for an ultimate account of why the laws of nature give rise to consciousness. Instead, it is about explaining a natural phenomenon within a theoretical framework that allows us to make predictions with respect to experimental outcomes.