Morality is a set of principles to guide one's actions. It is an identification of our own rationality, that in order to be happy, we must obtain values. And one can only be happy, if allowed to do so. If our principles and virtues, or manner with which we obtains values, orient us towards this reality, we are more successful. We operate egoistically, even when giving away, there is always a perceived benefit, or the choice wouldn't be made. The causally evolved singular nature of choice is why morality concerns the individual and why individual rights is the best way to relate to each other. It is because it is rational. Long term rational self-interest is moral. The nonaggression principle is moral because it is necessarily in each of our best actual, not just perceived, interests. Within nature are the reasons why libertarianism is moral. You need not search outside of reality. It has nothing to do with your god. Rights describe how individuals relate to each other, they do not exist as entities and were not given. We must agree to not force each other to have rights. Someone who can agree to a rational discourse, instead of a forceful one, is deserving of rights. Neither do right and wrong exist, absolutely; they are simply how one pattern represents another found in reality. These are relational terms. Not god-given dicta.