Bad choice of words, my bad...Lets scrap off volatile and change it with adaptable.

Sorry I don´t have much time to type. Lets just say that moral law does not apply equally to everybody! For example, an skimo whose mother is dying, will want to put her out of misery as soon as possible, this is what he would consider morally correct, whilst some other cultures would want to prolong her life for as long as possible despite of the suffering. That´s a silly example, but just to ilustrate that moral is not universal, different cultures have different moral values, moral values change with time too, like maybe fifty years ago homosexuality was highly inmoral in Europe, today, it is inmoral to discriminate against sexual orientations etc... and justice should be adapted best to those values.

As for roman law, I´m speechless. I´m not sure what you mean by "it doesn´t exist". Sure it is no longer applied today...