In my opinion, I believe moral law and the justice law should be as much aligned as possible. Governments serve individuals and families are the basic units of society. The problem nowadays, is a misconnection or broken bridge between old and new traditions.
In short, the generation gap and lack of communication.
The question tends to be racist as members of African society, traditional or modern, are equally human with respect to ALL other humans as are those of all other cultural groups and has no "special" classification! African societies have all developed, evolved, ethics and morality, which are influenced by living conditions of where they live. If they developed a privilege strata it is because all societies have done that and many have psychologically and philosophically reasoned privilege is not naturally, or Providentially, given. Ergo, protests and wars to assure a non-privilege class.
Natural Law theory suggests that an act is moral if in conformity with human nature. It derives its force from eternal law (divine governance) and is the foundation for positive laws, humabn rights and obligations. Circumstances affect morality but do not constitute it. Measure African society against thjs standard on a case by case basis
Natural law implies the holistic context within which original traditional societies live as an integral part of their natural environment. Nature is known as the primordial text which informs those cultures with moral and ethical guidelines.
And so for the traditional cultures, life itself is inclusive, cosmological, and not anthropocentric.
To what extent are African "traditional societies" similar in their moral norms? Curry et al. (2019) suggest that both traditional and nontraditional societies all over the world share approval of 7 cooperative behaviors. Specifics of norms, laws and traditions of course differ across societies and are influenced by geography and history, ecology, economic base, various demographic features, religion, and many other factors. But their work supports one possible version of a "natural law" approach to morality that appears to be a human universal.
Others believe that morality somehow is embodied in natural laws like Aquinas and Kant while others disagree. Now I believe it depends on perspective whether subjective or objective. Customary or traditional morality are not bad or wrong we are born with it. Now the continuing debate about it is the task of philosophers with their wisdom to explain it in a manner more humane and absence of arrogance. The best approaches are considering different perspectives and valuing respect. May I invite you to read ethics theory and practice by J. Thiroux a very comprehensive one with plenty of practical examples. Thank you.