That is the case in an ideal world, where we receive some blessed words inscribed upon our souls and also a way to read them. Since we don't live in that ideal

That is the case in an ideal world, where we receive some blessed words inscribed upon our souls and also a way to read them. Since we don't live in that ideal world, our only option is to designate some body to decide what are rights and what are not. Whether that body is a king or a judge or a council of judges or a legislative body or the full populace (or some combination of the above) is an important and worthwhile discussion, but in the end we do need to designate some entity to decide what the rights are.