The study of natural reality and social structures and truths surely has it's place, but I don't see how it negates the metaphysical truths. Objectivism and other such philosophies look to reality through a certain scope (all sciences must have a scope and a proper object, and no science can comprehend the whole of reality at once). I am just saying that the fact that objectivism focuses on certain aspects of reality in no way negates these ones that I am talking about. It doesn't mean they should interest you in particular, just that they must not be simply discarded, for they have their place too in the bigger picture