You're interpreting "explanations" in a different way than he meant it. You're looking for philosophical or religious explanations, but scientific theories by

You're interpreting "explanations" in a different way than he meant it. You're looking for philosophical or religious explanations, but scientific theories by their nature apply to more than one instance, and therefore explain, from one instance to the next, why things continue to behave in similar ways. If the many-worlds theory is correct and things are the way they are because this happens to be the one universe where they're that way, that wouldn't satisfy you because you'd want to know why universes exist at all, why the quantum fluctuations exist that lead to the big bang. If a grand unifying theory existed that provided a tautology proving that it, and only it, could ever be the underlying theory behind physics, you'd want to know why. Why is there physics at all? There are no underlying explanations of that kind. Even if you believe in God, why he chose one form of physics laws rather than another can never be explained unless someone has the good fortune to be in contact and write it down in a holy book, and someone will still ask why God made that choice and not another, or why that God exists and not another; any tautological argument for God can apply to a universal theory explaining all of physics: "it is because it is". Philosophy can only offer insights about how to think about human existence in a helpful (sociologically and psychologically helpful) way, but has nothing to say about the origins of physical theories.