Our law systems are mainly based on stories, like the tale that there is a divine spark in each human, therefore, each one is sacred therefore the right to life is absolute. But this is true depending on the framework of the narrative, another one would be: this guy, king X was named ruler over Earth by God, consequently, he has to decide in His name, who shall live or not. Virtue and ethics depend on the generally accepted framework, on the story that everybody believes which is embodied in the culture. There is general moral relativism determined by the difference between cultures across time and space, but that tends to not be such a problem these days due to the Europeanisation process of the World. As a consequence, there is no relativism in the sets of principles at the individual level because most men share of myths. There is no deeper level when it comes to morality because it is a human invention, an instrument that gives collision to large groups of humans.